Information leakage suppression device

Abstract

To provide an information leakage prevention device capable of making information in a hard disk unusable and preventing information leakage from the hard disk. [Solution] The information leakage prevention device 1 comprises a holder 14, a base body, and a holder arranged so as to contact the top surface of a hard disk, the holder having a first explosive loading section formed so as to penetrate from the bottom to the top inside the holder, a cover section, and an ignition device 22 having a heating section, a first type explosive layer 84 arranged within the first explosive loading section, in which the average particle size of metal powder particles is a first average particle size, and a second type explosive layer 86 arranged in contact with the first type explosive layer within the first explosive loading section, in which the average particle size of metal powder particles 82 is a second average particle size larger than the first average particle size, the first type explosive layer 84 being arranged closer to the hard disk than the second type explosive layer 86, and the first type explosive layer being arranged so as to contact the heating section of the ignition device.

Description

[Technical Field]

[0001] The present invention relates to an information leakage prevention device, for example, an information leakage prevention device that prevents information leakage from a hard disk. [Background technology]

[0002] Recently, various countermeasures have been proposed to prevent information leaks from hard disks. While measures have been taken to prevent intrusions into hard disks from networks, there is a need to address the issue of information leaks caused by physical theft of the computer along with the hard disk, or by the computer itself being forcibly taken away even if the theft is noticed.

[0003] For example, Patent Document 1 proposes a computer theft prevention system that utilizes the relative positions of the computer itself and its peripheral devices to lock the hard disk installed in the computer if the computer is stolen. [Prior art documents] [Patent documents]

[0004] [Patent Document 1] Japanese Patent Application Laid-Open No. 2012-053815 Summary of the Invention [Problem to be solved by the invention]

[0005] However, if the computer itself were to be taken away, it could be analyzed over time and internal information could be leaked.

[0006] Furthermore, in cases where it is unavoidable to quickly prevent the leakage of information from a computer, the conventional method has been to physically destroy it with a hammer or axe. However, because hard disks are made of die-cast aluminum and are covered with iron, they are relatively sturdy, and there are issues such as the risk of failing to destroy the contents or taking a long time.

[0007] Therefore, there is a demand for a more powerful and immediate means of preventing information leakage as a countermeasure against physical theft of a personal computer.

[0008] The present invention has been made to solve such problems, and has as its object to provide an information leakage prevention device that can make the information in a hard disk unusable and prevent information leakage from the hard disk. [Means for solving the problem]

[0009] In order to achieve the above object, according to one embodiment of the present invention, an information leakage prevention device for preventing information leakage from a hard disk comprises: a base body on which the hard disk is placed on its inner upper surface; a holder arranged so as to contact the upper surface of the hard disk, the holder having a first explosive loading section formed so as to penetrate the inside of the holder from the bottom to the top; a lid arranged so as to cover the top surface of the first explosive loading section of the holder; an ignition device having a heating section; a first type explosive layer arranged within the first explosive loading section, the first type explosive layer having a first average particle size of metal powder particles; and a second type explosive layer arranged within the first explosive loading section in contact with the first type explosive layer, the second type explosive layer having a second average particle size of metal powder particles larger than the first average particle size, the first type explosive layer being arranged closer to the hard disk than the second type explosive layer, and the first type explosive layer being arranged so as to contact the heating section of the ignition device. According to one embodiment of the present invention configured as described above, a first-type explosive layer is provided within the first explosive loading section, and the metal powder particles have a first average particle size, and a second-type explosive layer has the metal powder particles having a second average particle size larger than the first average particle size, and is provided in contact with the first-type explosive layer within the first explosive loading section, and the first-type explosive layer is positioned closer to the hard disk than the second-type explosive layer and is positioned so as to be in contact with the heating section of the ignition device. As a result, an opening is formed on the top surface of the hard disk by the first-type explosive layer having the metal powder particles of the first average particle size, and the metal powder particles in the second-type explosive layer having a second average particle size larger than the first average particle size are introduced into the hard disk through the opening while burning. The metal powder particles in the second type explosive layer have a second average particle size larger than the first average particle size, and therefore tend to roll and move while burning. The metal powder particles in the second type explosive layer spread over the platter of the hard disk as they burn, making it easier to render the storage surface of the platter unusable over a relatively wide area, rendering the information on the hard disk unusable and preventing information leakage from the hard disk. [Effects of the Invention]

[0010] According to the information leakage prevention device of the present invention, it is possible to make the information stored in the hard disk unusable, and to prevent information leakage from the hard disk. [Brief explanation of the drawings]

[0011] [Figure 1] 1 is a diagram showing the internal structure of a case of a personal computer in which an information leakage prevention device according to an embodiment of the present invention is installed, with the side panel removed. [Figure 2] 1 is a schematic perspective view of an information leakage prevention device according to an embodiment of the present invention; [Figure 3] 1 is an exploded perspective view of an information leakage prevention device according to an embodiment of the present invention; [Figure 4] 4 is a cross-sectional view of the information leakage prevention device according to the embodiment of the present invention, taken along line IV-IV in FIG. 2. FIG. [Figure 5]3 is a cross-sectional view of the information leakage prevention device according to the embodiment of the present invention, taken along line VV in FIG. 2. FIG. [Figure 6] FIG. 4 is a schematic diagram showing an enlarged view of the vicinity of the hard disk and also showing the relationship between the internal structure of the hard disk and the first explosive loading section and the second explosive loading section. [Figure 7] 1 is a block diagram showing a configuration of an information leakage prevention device according to an embodiment of the present invention; [Figure 8] A time chart showing the combustion timing of the first type explosive layer and the second type explosive layer of the first explosive loading section, and the combustion timing of the first type explosive layer on the second explosive loading section side of the second explosive loading section in an information leakage prevention device according to one embodiment of the present invention. [Figure 9] 2 is an enlarged schematic diagram showing the vicinity of a first explosive loading section in the information leakage prevention device according to one embodiment of the present invention. FIG. [Figure 10] 10 is a schematic diagram illustrating the configuration of metal powder particles and oxidizer particles of a second explosive layer introduced into a platter of a hard disk in an information leakage prevention device according to an embodiment of the present invention. FIG. [Figure 11] 1 is a schematic diagram illustrating metal powder particles and oxidizer particles moving on a platter of a hard disk in an information leakage prevention device according to an embodiment of the present invention. [Figure 12] FIG. 10 is a schematic diagram illustrating a modified information leakage prevention device in which a first explosive loading unit is disposed above a spindle motor unit and metal powder particles and oxidizer particles are introduced onto a platter of a hard disk. DETAILED DESCRIPTION OF THE INVENTION

[0012] An information leakage prevention device 1 according to an embodiment of the present invention will be described below with reference to the accompanying drawings. The embodiments of the present disclosure have been described as examples, and it will be apparent to those skilled in the art that many variations, modifications, and substitutions can be made within the spirit and scope of the present invention. Therefore, the present invention is not limited to the disclosed embodiments, and various variations, modifications, etc. can be made in form and details without departing from the scope of the claims. Furthermore, the components disclosed in the specification can be freely combined.

[0013] As shown in FIG. 1, an information leakage prevention device 1 according to one embodiment of the present invention can provide a device for preventing information leakage from a hard disk. The information leakage prevention device 1 also functions as a device for destroying a hard disk 50 (see FIG. 3) to render the information stored on the hard disk unusable. For example, if a hard disk is attempted to be forcibly removed along with a PC, or if the hard disk has been forcibly removed, the information leakage prevention device 1 can instantly render the information stored on the hard disk unusable by igniting explosives within a short period of a few seconds, thereby preventing information leakage from the hard disk. The hard disk 50 generally has a bottom portion of a hard disk case made of die-cast aluminum, and a 0.3 mm or 0.5 mm steel plate on the top surface of the hard disk case. Therefore, it is relatively hard and difficult to destroy physically. In the following description of one embodiment of the present invention, one longitudinal side of the information leakage prevention device 1 is referred to as the front side as shown in Figure 2, and the opposite side is referred to as the rear side, and when facing the front side of the information leakage prevention device 1, the right-hand side is referred to as the right side, the left-hand side is referred to as the left side, and the upper side of the information leakage prevention device 1 is referred to as the upper side, and the lower side is referred to as the lower side.

[0014] As shown in FIG. 1, the information leakage prevention device 1 is placed inside a case 3 of a personal computer (PC) 2. The PC 2 is, for example, a desktop PC placed on an office desk. The case 3 is box-shaped, and FIG. 1 shows the case 3 with its side panel removed to reveal the internal structure. The PC 2 includes a motherboard 6 on which a CPU, memory, and other components are mounted, a first power supply 7 that supplies power to the motherboard 6 and a hard disk 50 (see FIG. 3), the hard disk 50, and the information leakage prevention device 1. The information leakage prevention device 1 incorporates the hard disk 50 and, as described below, is sized similarly to a 3.5-inch hard disk drive. Therefore, the information leakage prevention device 1 can be easily accommodated in a 3.5-inch drive bay 9 in the case 3 of a commercially available PC 2. As shown in FIG. 1, multiple 3.5-inch drive bays 9 are formed inside the case 3. A user can, for example, install and add a hard disk or other device in one of these 3.5-inch drive bays 9. A cooling fan 11 and the like are also provided inside the case 3. A description of the internal structure of a typical personal computer 2 will be omitted.

[0015] As shown in Figures 2 and 3, the information leakage prevention device 1 includes a base body 12 having a receiving portion for receiving a hard disk 50, a holder 14, a lid portion 16, an ignition device 22, a first type explosive layer 84 (see Figure 9), and a second type explosive layer 86.

[0016] As shown in FIG. 3, the base body 12 has a hard disk 50 disposed on its inner upper surface. The base body 12 is rectangular in top view, measuring 14.6 cm in length (depth) in the front-to-back direction and 10.2 cm in length (width) in the left-to-right direction. The outer size of the base body 12 is the same as that of a so-called 3.5-inch hard disk drive. The base body 12 has a flat base with its outer periphery raised, and a recessed portion 12a formed in the center. The recessed portion 12a forms a receiving portion for receiving the hard disk 50. The hard disk 50 is, for example, a so-called 2.5-inch hard disk drive. The recessed portion 12a is formed so that a small gap is formed on the outside when, for example, a so-called 2.5-inch hard disk drive is disposed inside. The bottom surface of the recessed portion 12a is flat and rectangular. For example, when a so-called 2.5-inch hard disk drive is placed inside, the top surface 50a of the hard disk 50 and the top surface 12b of the outer periphery of the base body 12 are formed to be at the same height. Therefore, the holder 14 and the base body 12 are combined with each other in a state where the holder 14 is in contact with both the top surface 50a of the hard disk 50 and the top surface 12b of the base body 12. By forming it in this way, a commercially available high-performance so-called 2.5-inch hard disk drive can be used, and the overall external size of the information leakage prevention device 1 can be made the same as that of a so-called 3.5-inch hard disk drive, and it can be placed in the hard disk storage slot of a general personal computer. Furthermore, because a single screw fastens the cover 16 and the base body 12 and penetrates the holder 14, it is possible to configure the information leakage prevention device 1 even if the size of the hard disk drive to be accommodated in the recess varies slightly. Although the change in overall size reduces the convenience of PC placement, it still provides a certain level of effectiveness as an information leakage prevention device.

[0017] The base body 12 is formed of a stainless steel metal member. The base body 12 forms an exhaust passage 12c that continues from the space formed between the inner surface of the base body 12 and the hard disk 50 to the outside of the base body 12. By forming the exhaust passage 12c, when the gunpowder burns explosively, the expanding gas is exhausted through the exhaust passage 12c, and it is possible to prevent the base body 12, holder 14, and lid 16 from exploding and damaging surrounding objects.

[0018] 3 and 6, the hard disk 50 disposed on the base body 12 will now be described. The hard disk 50 is, for example, a so-called 2.5-inch hard disk 50 device. The hard disk 50 generally comprises a hard disk structure 51 whose lower part is formed by die-casting aluminum, a spindle motor part 52 arranged on the hard disk structure 51, a platter 53, an actuator 54, a magnetic head 55, and a hard disk case 56.

[0019] The hard disk structure 51 is provided at the base of the hard disk 50. A spindle motor unit 52, an actuator 54, etc. are attached to the top surface of the hard disk structure 51. The hard disk structure 51 is formed in a rectangular shape when viewed from above. The hard disk structure 51 itself forms the lower part of the hard disk case 56, and is fixed to the hard disk case 56 at its outer periphery. The lower part of the hard disk structure 51 is formed from a metal member such as aluminum die-cast.

[0020] The spindle motor unit 52 is formed to rise vertically from the hard disk structure 51. The spindle motor unit 52 is formed in a cylindrical shape. The spindle motor unit 52 has a built-in spindle motor and is configured so that the rotation of the spindle motor causes the platter 53 to rotate around the spindle motor unit 52. The inner peripheral portion of the platter 53 is connected to the outer peripheral portion of the spindle motor unit 52. For example, four platters 53 are connected to the spindle motor unit 52 in a vertically aligned state. The spindle motor unit 52 is configured so that it can rotate at a predetermined rotation speed.

[0021] The platter 53 is formed on a disk. The platter 53 is formed on a thin, flat plate. When viewed from above, the platter 53 is circular with a predetermined diameter. The platter 53 has a storage area on its upper surface, allowing for large-capacity data storage. The platter 53 has a recording magnetic layer on its upper surface. The platter 53 is connected at its center to the spindle motor unit 52. This allows the platter 53 to rotate as the spindle motor unit 52 rotates. A magnetic head 55 moves over the platter 53, allowing the magnetic head 55 to read information stored on the platter 53. The platter 53 is formed, for example, from four platters 53, arranged vertically. The storage layer and magnetic layer of the platter 53 form a delicate storage area, and even slight heat or contamination such as soot can cause serious damage that renders the device unusable.

[0022] The actuator 54 is disposed on the outside of one side of the platter 53, and is disposed on the hard disk structure 51. The actuator 54 is formed between the platter 53 and a third wall 56c, which will be described later. The actuator 54 is connected to the magnetic head 55, and is configured to be able to move the magnetic head 55 in the scanning direction. The actuator 54 is also formed between a first wall 56a (see FIG. 3) and a second wall 56b of the hard disk case 56.

[0023] The magnetic head 55 is disposed inside the hard disk case 56. The magnetic head 55 has a fork-shaped data reading portion. In the initial state, the magnetic head 55 is disposed outside the platter 53. When reading data, the magnetic head 55 is positioned above the platter 53 by the actuator 54. The magnetic head 55 has the function of writing data onto the platter 53 and the function of reading data from the platter 53.

[0024] The hard disk case 56 forms the outer case of the hard disk 50. The hard disk case 56 is formed of a first wall 56a (see FIG. 3) extending in the longitudinal direction, a second wall 56b extending parallel to the first wall 56a, a third wall 56c extending in the lateral direction from one end of the first wall 56a, and a fourth wall 56d extending parallel to the third wall 56c. The third wall 56c is a wall provided on the side of the magnetic head 55 and actuator 54. The fourth wall 56d is a wall provided on the side of the platter 53. A flat plate 56e on the top surface of the hard disk 50 forms the top of the hard disk case 56.

[0025] The holder 14 is disposed so as to contact the upper surface of the hard disk 50. When viewed from above, the holder 14 is formed in a rectangular shape, with a length (depth) in the front-to-back direction of 14.6 cm and a length (width) in the left-to-right direction of 10.2 cm. The outer size of the holder 14 is the same as that of a so-called 3.5-inch standard hard disk drive. The holder 14 forms a flat plate. The holder 14 is formed from a stainless steel metal member.

[0026] The lid 16 is provided to cover the upper surfaces of the first explosive loading section 18 and the second explosive loading section 26 of the holder 14. The lid 16 is disposed on the upper surface of the holder 14 and is formed in a flat plate shape. When viewed from above, the lid 16 is formed in a rectangular shape, with a length (depth) in the front-to-back direction of 14.6 cm and a length (width) in the left-to-right direction of 10.2 cm. The outer size of the lid 16 is the same as that of a so-called 3.5-inch hard disk drive. The lid 16 forms a flat plate. The lid 16 is formed of a stainless steel metal member. Screw holes are formed near the four corners of the lid 16, and screws are inserted into each hole and fastened to the base body 12 by passing through the holder 14, firmly clamping the lid 16, the holder 14, and the base body 12 together. The thickness (height) of the structure in which these components are assembled together is 2.5 cm.

[0027] 4 to 6, the holder 14 includes a first explosive loading section 18 formed so as to penetrate from the bottom surface to the top surface inside the holder 14, and a second explosive loading section 20 provided at a position spaced apart from the first explosive loading section 18 and formed so as to penetrate from the bottom surface to the top surface inside the holder 14. Note that the internal structure of the hard disk 50 is not shown in FIGS.

[0028] The first explosive loading section 18 is formed inside the holder 14 so as to penetrate from the bottom to the top. The first explosive loading section 18 is configured to have a first type explosive layer 84 and a second type explosive layer 86 disposed therein. The first type explosive layer 84 can be made of a common explosive, such as black powder, smokeless powder, or solid propellant, but contains metal powder particles 80 and oxidizer particles 81 of a predetermined size. The second type explosive layer 86 can also basically be made of a common explosive, such as black powder, smokeless powder, or solid propellant, but contains metal powder particles 82 and oxidizer particles 83 of a predetermined size. The first type explosive layer 84 and the second type explosive layer 86 can be made of, for example, a flammable rubber base material mixed with an oxidizer or metal particles. The first explosive loading section 18 includes a first cylindrical section 40 formed in a cylindrical shape and an extension section 42 extending laterally from the cylindrical section. The first cylindrical portion 40 of the first explosive loading portion 18 is formed to extend linearly from the lower surface to the upper surface of the holder 14. The first explosive loading portion 18 is not limited to a cylindrical shape and may be formed to have a rectangular cross section or other shapes. The diameter of the first explosive loading portion 18 is, for example, a value within a range of 5 mm to 15 mm, for example, a value within a range of 5 mm to 10 mm. The vertical length of the first cylindrical portion 40 of the first explosive loading portion 18 is the same as the vertical length of the second cylindrical portion 44 of the second explosive loading portion 20. The first explosive loading portion 18, for example, a central axis X1 (see FIG. 6) of the first explosive loading portion 18, is disposed so as to be perpendicular to the hard disk 50. The central axis X1 of the first cylindrical portion 40 is disposed at a position offset from the spindle motor unit 52 of the platter 53 of the hard disk 50 in a top view. As a result, the combustion of the explosives in the first explosive loading section 18 causes the metal powder particles 82 and oxidizer particles 83 of the second type explosive layer 86 to penetrate into the hard disk 50 at a position offset from the spindle motor section 52 of the platter, as shown by arrow D1, and the main stream of flame and high-temperature gases associated with the flame tends to spread concentrically around the lower front portion of the first explosive loading section 18 and the platter in the lower front portion, effectively rendering the data stored on the platter unusable.

[0029] The combustion of the first explosive layer 84, primarily in the lower portion of the first cylindrical portion 40 of the first explosive loading portion 18, can form a hole in the top surface of the hard disk case 56, as indicated by arrow D1. The first explosive loading portion 18 primarily forms a hole in the top surface (top surface) of the hard disk case 56, but may also render some of the stored data on the platter 53 unusable. The first explosive loading portion 18 is located above the end 53d of the platter opposite the actuator side. The first explosive loading portion 18 is positioned point-symmetrically with the second explosive loading portion 20, with the spindle motor portion 52 at the center. In a top view, the distance from the first explosive loading portion 18 to the spindle motor portion 52 is approximately the same as the distance from the second explosive loading portion 20 to the spindle motor portion 52. The first explosive loading portion 18 can be positioned anywhere.

[0030] The extension portion 42 extends laterally from the upper portion of the first cylindrical portion 40. The extension portion 42 extends laterally from the first cylindrical portion 40 by a length ranging from 10 mm to 30 mm, for example. Therefore, the first cylindrical portion 40 and the extension portion 42 form an L-shaped storage portion. The extension portion 42 is formed in a rectangular parallelepiped shape. The extension portion 42 extends linearly in the horizontal direction. The upper end of the extension portion 42 is formed on the upper surface of the holder 14. Therefore, the extension portion 42 is open at the upper surface of the holder 14. The extension portion 42 is formed in a rectangular shape when viewed from above. The extension portion 42 is formed so that the second explosive layer 86 can be additionally filled therein in addition to the first cylindrical portion 40. Since the second explosive layer 86 is additionally filled in the extension portion 42, the second explosive layer 86 can burn for a longer period of time. The longitudinal length of the extension portion 42 is within a range of 10 mm to 30 mm. The lateral length of the extension portion 42 is within a range of 5 mm to 20 mm. The lateral length of the extension portion 42 is approximately the same as or shorter than the diameter of the first cylindrical portion 40. The vertical height H2 of the extension portion 42 (see FIG. 4) is shorter than the vertical height H1 of the first cylindrical portion 40. The vertical height H2 of the extension portion 42 is, for example, shorter than half the vertical height H1 of the first cylindrical portion 40. The first cylindrical portion 40 and the extension portion 42 have a gunpowder arrangement length that is a distance within a range of 10 mm to 50 mm, while bending midway. The gunpowder arrangement length is the length of the gunpowder arranged from the inlet at the lower end of the first cylindrical portion 40 to the top of the first cylindrical portion 40 and further to the end of the extension portion 42 opposite the cylindrical portion. The first explosive loading section 18 is formed so that it can store a first storage capacity E1 of explosives using the first cylindrical section 40 and the expansion section 42. In this way, the first explosive loading section 18 is formed so that it can store a larger volume of explosives than the second explosive loading section 20. The first storage capacity E1 is, for example, the total volume of the first cylindrical section 40 and the expansion section 42.

[0031] The second explosive loading section 20 is formed so as to penetrate from the lower surface to the upper surface inside the holder 14. The second explosive loading section 20 includes a second cylindrical section 44 formed so as to extend linearly from the lower surface to the upper surface of the holder 14. The second cylindrical section 44 is formed in a cylindrical shape. The second explosive loading section 20 is configured so as to have a second explosive loading section-side first type explosive layer 88 disposed therein. The second explosive loading section 20 includes the second explosive loading section-side first type explosive layer 88 without including the second explosive loading section 20-side first type explosive layer 88. The second explosive loading section 20 does not include an expansion section that allows additional explosive to be added thereto. This allows the second explosive loading section 20 to complete the combustion of the explosive in a relatively short combustion time, sufficient to form the second opening 56g, and allows the second opening 56g to also function as an exhaust passage. The second-explosive-loading-portion-side first-type explosive layer 88 can basically be composed of a common explosive, such as black powder, smokeless powder, or solid propellant, but also contains metal powder particles 80 and oxidizer particles 81 of a predetermined size. The second-explosive-loading-portion-side first-type explosive layer 88 can be composed of, for example, a flammable rubber base material mixed with an oxidizer or metal particles. In this embodiment, the second-explosive-loading-portion-side first-type explosive layer 88 has the same basic components as the first-type explosive layer 84. The first-type explosive layer 84 and the second-explosive-loading-portion-side first-type explosive layer 88 differ mainly in their positions. The second cylindrical portion 44 is formed so as to extend linearly from the lower surface to the upper surface of the holder 14. The second cylindrical portion 44 is not limited to a cylinder and may be formed with a square cross section or other shapes. The diameter of the second cylindrical portion 44 is, for example, a value within a range of 5 mm to 15 mm, for example, a value within a range of 5 mm to 10 mm. The surface area of ​​the burning portion of the explosive affects the combustion pressure, causing a hole to open in the hard disk case 56. The vertical length of the second cylindrical portion 44 is the same as the vertical length of the first cylindrical portion 40. The central axis X2 of the second cylindrical portion 44 is disposed so as to be perpendicular to the hard disk 50. The central axis X2 of the second explosive loading portion 20 is disposed in a position parallel to but different from the central axis X1 of the first explosive loading portion 18. The central axis X2 of the second cylindrical portion 44 is disposed in a position offset from the spindle motor portion 52 of the platter of the hard disk 50 when viewed from above.As a result, an opening is formed at a position offset from the spindle motor portion 52 of the platter by combustion of the first explosive layer 88 on the second explosive loading portion side of the second cylindrical portion 44 .

[0032] Combustion of the second-explosive-loading-unit-side first-type explosive layer 88 below the second cylindrical portion 44 of the second explosive loading unit 20 can form a hole in the top surface of the hard disk case 56, as indicated by arrow D2 (see FIG. 6 ). The second explosive loading unit 20 primarily forms a hole in the top surface of the hard disk case 56, but may also render some of the stored data on the platter 53 unusable. The second explosive loading unit-side first-type explosive layer 88 forms a hole in the top surface of the hard disk case 56, as indicated by arrow D2, but combustion is terminated early, as described below. The second explosive loading unit 20 is located above the actuator-side end 53c of the platter 53. The second explosive loading unit 20 is positioned point-symmetrically with the first explosive loading unit 18, with the spindle motor unit 52 at the center. In a top view, the distance from the first explosive loading unit 18 to the spindle motor unit 52 is approximately the same as the distance from the second explosive loading unit 20 to the spindle motor unit 52. The second explosive loading section 20 can be placed at any position. The second explosive loading section 20 is formed so that a second storage capacity E2 of explosive can be stored in the second cylindrical section 44. The second storage capacity E2 is, for example, the volume of the second cylindrical section 44.

[0033] The first explosive loading section 18 and the second explosive loading section 20 are formed so that the burning time of the first type explosive layer 84 and the second type explosive layer 86 of the first explosive loading section 18 is longer than the burning time of the second explosive loading section side first type explosive layer 88 of the second explosive loading section 20. As a result, even after the burning of the second explosive loading section side first type explosive layer 88 of the second explosive loading section 20 has finished, the burning of the first type explosive layer 84 and the second type explosive layer 86 of the first explosive loading section 18 continues. As a result, air can easily escape from the first explosive loading section 18 to the second explosive loading section 20 in the space inside the hard disk 50, which is a relatively sealed space, and the metal powder particles 82 and the oxidizer particles 83 of the second type explosive layer 86 can easily be introduced from the first explosive loading section 18 into the hard disk 50. This makes it easier to set an area where the metal powder particles 82 and the oxidizer particles 83 of the second type explosive layer 86 can move easily. Therefore, the metal powder particles 82 and the oxidizer particles 83 of the second type explosive layer 86 can more easily and efficiently render a wide range of the platter 53 unusable.

[0034] Furthermore, for example, the first explosive loading section 18 and the second explosive loading section 20 are formed so that the total first storage capacity E1 of the first type explosive layer 84 and the second type explosive layer 86 of the first explosive loading section 18 is larger than the second storage capacity E2 of the second explosive loading section side first type explosive layer 88 of the second explosive loading section 20. As a result, even after combustion of the second explosive loading section side first type explosive layer 88 of the second explosive loading section 20 has finished, combustion of the first explosive layer 84 and the second explosive layer 86 of the first explosive loading section 18, for example, mainly the second explosive layer 86 of the second explosive layer 86, continues. This makes it easier for air to escape from the first explosive loading section 18 toward the second explosive loading section 20 within the relatively sealed space inside the hard disk 50, making it easier for the metal powder particles 82 and oxidizer particles 83 of the second type explosive layer 86 to be introduced from the first explosive loading section 18 into the hard disk 50. This makes it easier for the metal powder particles 82 and oxidizer particles 83 of the second type explosive layer 86 to move within the hard disk 50, making it easier to efficiently render a wide area of ​​the platter 53 unusable.

[0035] 4, the first explosive loading section 18 and the second explosive loading section 20 are formed so that the length L1 of the first type explosive layer 84 and the second type explosive layer 86 arranged in the first explosive loading section 18 from the first explosive loading section entrance 18a is longer than the length L2 of the second explosive loading section side first type explosive layer 88 arranged in the second explosive loading section 20 from the second explosive loading section entrance 20a. The length of the explosive combustion time corresponds to the length of the explosive. Therefore, the total combustion time of the first type explosive layer 84 and the second type explosive layer 86 is longer than the combustion time of the second explosive loading section side first type explosive layer 88. As a result, even after combustion of the first type explosive layer 88 on the second explosive loading section side of the second explosive loading section 20 has finished, combustion of the first type explosive layer 84 and the second type explosive layer 86 of the first explosive loading section 18 continues, and air can easily escape from the first explosive loading section 18 toward the second explosive loading section 20 within the relatively sealed space inside the hard disk 50. This makes it easier for the metal powder particles 82 and the oxidizer particles 83 of the second type explosive layer 86 to move within the hard disk 50, making it easier to efficiently render a wide area of ​​the platter 53 unusable.

[0036] The first type explosive layer 84 is provided in the lower part of the first explosive loading section 18. The first type explosive layer 84 is provided mainly in the first explosive loading section inlet section 18a. The first type explosive layer 84 is formed in a circular shape when viewed from below. The first type explosive layer 84 is arranged so as to cover the entire lower surface of the first explosive loading section inlet section 18a. The vertical height H3 (see FIG. 4) of the first type explosive layer 84 is shorter than the vertical height H1 (see FIG. 4) of the first cylindrical section 40. The first type explosive layer 84 is arranged closer to the hard disk than the second type explosive layer 86. The first type explosive layer 84 is arranged so as to be in contact with the heating section 22a of the ignition device 22. The first type explosive layer 84 includes, for example, metal powder particles 80 and oxidizer particles 81. The ratio of the metal powder particles 80 to the ratio of the oxidizer particles 81 contained in the first type explosive layer 84 is set to be approximately the same. In the first type explosive layer 84, the average particle size of the metal powder particles 80 is a first average particle size. The first average particle size of the metal powder particles 80 in the first type explosive layer 84 is an average particle size with a value within a range of 0.01 mm to 0.03 mm. In the first type explosive layer 84, the average particle size of the oxidizer particles 81 is a first average particle size. The first average particle size of the oxidizer particles 81 in the first type explosive layer 84 is an average particle size with a value within a range of 0.01 mm to 0.03 mm. The first type explosive layer 84 may be configured so that the average particle size of the metal powder particles 80 is the first average particle size, and the average particle size of the oxidizer particles 81 is the first average particle size. Since the metal powder particles 80 have the predetermined first average particle size, they are relatively small particles that can easily burn stably at a relatively high temperature, and openings can be formed in a relatively short time.

[0037] The second explosive layer 86 is provided in contact with the first explosive layer 84 within the first explosive loading section 18. The second explosive layer 86 is disposed so as to rest on top of the first explosive layer 84. The second explosive layer 86 is disposed above the first explosive layer 84 and within the first cylindrical section 40. Because the second explosive layer 86 is disposed above the first explosive layer 84, the second explosive layer 86 is likely to be ignited smoothly following the combustion of the first explosive layer 84. Furthermore, the second explosive layer 86 is disposed so as to be likely to fall downward and be introduced into the hard disk 50 when the first explosive layer 84 burns and forms an opening downward. The shape of the lower surface of the second explosive layer 86 generally corresponds to the shape of the upper surface of the first explosive layer 84. The lower surface of the second explosive layer 86 is formed in a circular shape, which generally corresponds to the circular cross section of the first cylindrical section 40. The second type explosive layer 86 extends from the top of the first cylindrical portion 40 toward the expansion portion 42. The second type explosive layer 86 is also disposed within the expansion portion 42. The second type explosive layer 86 is formed up to the top of the first explosive loading portion 18. The second explosive layer 86 includes, for example, metal powder particles 82 and oxidizer particles 83. The proportion of the metal powder particles 82 and the proportion of the oxidizer particles 83 contained in the second explosive layer 86 are approximately the same. The second explosive layer 86 has a second average particle size, which is larger than the first average particle size. The second explosive layer 86 has a second average particle size, which is larger than the first average particle size. The second average particle size of the metal powder particles 82 in the second explosive layer 86 is an average particle size ranging from 0.1 mm to 0.3 mm. The metal powder particles 82 have a predetermined second average particle size, which allows the particle size to be large enough to facilitate movement on the platter, without increasing the average particle size to a level that would hinder combustion. The metal powder particles 80 have a predetermined second average particle size, which may result in a slight decrease in combustion temperature or uneven combustion, but allows the surface water vapor to evaporate, facilitating particle movement.

[0038] In the second explosive layer 86, the average particle size of the oxidizer particles 83 is set to a second average particle size. The second average particle size of the oxidizer particles 83 in the second explosive layer 86 is an average particle size of a value within a range of 0.1 mm to 0.3 mm. The second average particle size of the metal powder particles 82 in the second explosive layer 86 is a value within a range of 5 to 30 times, for example, a value within a range of 5 to 20 times, or for example, a value within a range of 5 to 10 times, the first average particle size of the metal powder particles 80 in the first explosive layer 84. In this way, the second average particle size of the metal powder particles 82 in the second explosive layer 86 is set to a relatively large particle size, 5 to 30 times the first average particle size, which can facilitate irregular movement during combustion. The second explosive layer 86 may be configured so that the average particle size of the metal powder particles 82 is set to the second average particle size and the average particle size of the oxidizer particles 83 is set to the second average particle size. The metal powder particles 82 of the second type explosive layer 86 have a second average particle size larger than the first average particle size, and therefore tend to move like a roll while burning, and the metal powder particles 82 of the second type explosive layer 86 spread over the platter 53 of the hard disk while burning (so as to burn the platter over a relatively wide area), making it easier to render the storage surface of the platter 53 unusable over a relatively wide area, making the information on the hard disk 50 unusable, and preventing information leakage from the hard disk.

[0039] The second explosive layer 86 includes metal powder particles 82 and oxidizer particles 83, but may also include other substances such as a binder such as rubber. The second explosive layer 86 functions as an explosive and includes metal powder particles 82 and oxidizer particles 83 that have larger average particle sizes than the metal powder particles 80 (see FIG. 9) and oxidizer particles 81 of the first explosive layer 84.

[0040] The first type explosive layer 84 of the first explosive loading section 18 is configured with an amount that allows a hole to be drilled in the top plate of the hard disk 50. As a result, a first opening 56f is formed by combustion of the first type explosive layer 84, making it easier to combust the metal powder particles 82 and oxidizer particles 83 of the second type explosive layer 86 on the platter 53. The second type explosive layer 86 of the first explosive loading section 18 is larger than the first type explosive layer 84 of the first explosive loading section. As a result, the second type explosive layer 86 burns more explosive than the first type explosive layer 84, introducing the metal powder particles 82 onto the platter and making it easier to render a relatively wide area of ​​the storage surface of the platter unusable. The second explosive amount in the second type explosive layer 86 of the first explosive loading section 18 is an amount within a range of 2 to 10 times the first explosive amount in the first type explosive layer 84 of the first explosive loading section, and may be, for example, an amount within a range of 2 to 8 times, or may be, for example, an amount within a range of 2 to 5 times. In this way, the second explosive amount in the second type explosive layer 86 is relatively larger than the first explosive amount in the first type explosive layer 84, increasing the amount of explosive burned within the hard disk 50 and making it easier to disable a relatively wide area of ​​the storage surface of the platter, thereby making the information on the hard disk unusable.

[0041] The lid portion 16 is disposed on the upper surface of the holder 14 and is formed in a flat plate shape. The lid portion 16 is provided so as to cover the upper surfaces of the first explosive loading portion 18 and the second explosive loading portion 20 of the holder 14. The lid portion 16 is formed in a rectangular shape in a top view, with a length (depth) in the front-to-back direction of 14.6 cm and a length (width) in the left-to-right direction of 10.2 cm. The outer size of the lid portion 16 is the same as that of a so-called 3.5-inch standard hard disk drive. The lid portion 16 forms a flat plate. The lid portion 16 is formed of a stainless steel metal member. Screw holes are formed near the four corners of the lid portion 16, and screws are inserted into each of the holes to pass through the holder 14 and fasten to the base body 12, firmly clamping the lid portion 16, the holder 14, and the base body 12 together. The thickness (height) of the structure in which these components are assembled together is 2.5 cm.

[0042] In this manner, the combination of the base body 12 with the hard disk 50 placed inside, the holder 14, and the lid 16 forms a rectangular shape with a depth L of 14.6 cm, a width W of 10.2 cm, and a height H of 2.5 cm, as shown in Figures 1 and 3. Therefore, this combination is formed into the same external size as a 3.5-inch standard hard disk drive.

[0043] The information leakage prevention device 1 further includes an ignition device 22 that ignites the first type explosive layer 84 and / or the first type explosive layer 88 on the second explosive loading section side, a second power supply device 24, and an operating device 30.

[0044] The second power supply device 24 supplies power to the ignition device 22 and the actuation device 30 independently of the first power supply device 7 of the personal computer 2, which supplies power to the hard disk 50. The second power supply device 24 is disposed within the case 3. The second power supply device 24 can be configured, for example, with a dry cell or a battery. Therefore, even if the power to the personal computer 2 is disconnected, the second power supply device 24 can activate the ignition device 22 using a power supply from a separate system. The second power supply device 24 may be disposed in a space within the information leakage prevention device 1. The second power supply device 24 is electrically connected to the ignition device 22, the actuation device 30, etc. The second power supply device 24 may be electrically connected to the first power supply device 7 for charging functions, etc.

[0045] The actuating device 30 includes, for example, a wire loop sensor. When the loop circuit of the electric wire 32 of the actuating device 30 is broken or disconnected, a detection unit detects that the circuit has been broken and transmits an actuation signal to the ignition device 22. As a result, for example, if an attempt is made to remove the PC 2 along with the case 3, the loop circuit of the actuating device 30 is broken, and the ignition device 22 is immediately activated. Also, for example, if an attempt is made to remove the information leakage prevention device 1 from the drive in the case 3 without following the proper procedure and remove it, the loop circuit of the actuating device 30 may be broken, and the ignition device 22 may be immediately activated. The actuating device 30 is arranged inside the case 3, and the loop circuit of the electric wire 32 is configured to return to the inside of the case 3 via a member outside the case 3. The actuation device 30 may be provided with a wireless communication unit capable of wireless communication, and may receive a predetermined actuation signal from the outside to determine actuation of the ignition device 22 and transmit the actuation signal to the ignition device 22. This allows the administrator to actuate the ignition device 22 from a remote location to prevent information leakage.

[0046] The ignition device 22 is configured to be able to ignite the first type explosive layer 84 and / or the first type explosive layer 88 on the second explosive loading section side. The ignition device 22 includes a heating section 22a wound with, for example, a nichrome wire. The ignition device 22 is connected to a second power supply device 24 that independently supplies power to the ignition device 22. The ignition device 22 is connected to the second power supply device 24 via a power line 22b. In FIG. 4, the power line 22b is indicated by a dashed line. The ignition device 22 is operated by a command from the operating device 30, and when electricity is applied to the heating section 22a, the nichrome wire is heated to a high temperature, for example, about 300 to about 400 degrees, thereby igniting the first type explosive layer 84 and / or the first type explosive layer 88 on the second explosive loading section side. As a variant, the ignition device 22 may use an ignition ball, ignite the ignition ball by passing electricity through the ignition ball, and ignite the first type explosive layer 84 and / or the first type explosive layer 88 on the second explosive loading section side by the ignition ball.

[0047] The ignition device 22 has a function of controlling ignition upon receiving an activation command from the activation device 30, for example. When the ignition device 22 receives an activation command, it starts energizing the heating unit 22a to ignite the first type explosive layer 84 and / or the first type explosive layer 88 on the second explosive loading unit side. When it determines that it has not received an activation command, the ignition device 22 is controlled not to energize the heating unit 22a. The activation device 30 may be disposed, for example, in a position separated from the holder 14, etc., within the case 3. The ignition device 22 is electrically connected to the heating unit 22a and the second power supply device 24. Note that all or a part of the ignition device 22 may be formed by a control unit, such as a memory, of the personal computer 2. The ignition device 22 incorporates a CPU 17 and a storage device 19, such as a memory, etc., and controls connected devices to execute predetermined control based on a predetermined control program recorded in the memory, etc. The ignition device 22 is electrically connected to the actuation device 30, the second power supply device 24, etc. These electrical connections may be made via wireless communication or the like. The ignition device 22 stores a program that can execute an operation mode in which current is supplied to the heating unit 22a when an operation command is received. The ignition device 22 also stores a program that can execute a non-operation mode in which current is not supplied to the heating unit 22a when an operation command is not received.

[0048] Next, a method for manufacturing and arranging the information leakage prevention device 1 will be described with reference to FIG.

[0049] First, a step of preparing the base body 12, the holder 14, and the cover part 16 of the information leakage prevention device 1 is performed. Next, a so-called 2.5-inch hard disk 50 is placed in the recess 12a of the base body 12. The hard disk 50 is electrically connected to the motherboard 6 and is configured so that it can be used in the same way as a normal hard disk 50.

[0050] 4, a first type explosive layer 84 and a second type explosive layer 86 are disposed in the first cylindrical portion 40 and the expansion portion 42 of the first explosive loading portion 18 of the holder 14. A heating portion 22a of the ignition device 22 is disposed at the lower end of the first type explosive layer 84. The ignition device 22 is connected to the heating portion 22a via a power line 22b.

[0051] The step of combining the base body 12 on which the hard disk 50 is placed, the holder 14 in a state in which the first type explosive layer 84 and the second type explosive layer 86 are loaded in the first explosive loading section 18 and the first type explosive layer 88 on the second explosive loading section side is loaded in the second explosive loading section 20, and the lid section 16 is then performed, and screws are inserted into the screw holes formed in the four corners to firmly fasten and fix the lid section 16, holder 14, and base body 12 together. The information leakage suppression device 1 is placed in the 3.5-inch drive bay 9.

[0052] The electric wire 32 of the operating device 30 is wired in a proper arrangement so as to prevent theft of the personal computer, and the ignition device 22 electrically connected to the operating device 30 is set to a standby state.

[0053] Next, the operation of the information leakage prevention device 1 to disable the platters in the hard disk 50 will be described with reference to FIGS.

[0054] 9 and 10 show a schematic top view of the inside of the hard disk 50, and illustrate the positional relationship between the platter 53 of the hard disk 50 and the first explosive loading section 18. In FIG. 9 shows a state in which a first explosive layer 84 and a second explosive layer 86 are provided side by side in the first explosive loading section 18. In FIG. 9, for example, metal powder particles 82 are represented by circles, and oxidizer particles 83 are represented by circles with an X inside. Furthermore, the metal powder particles 80 and oxidizer particles 81 of the first explosive layer 84 are illustrated as having relatively small particle sizes, while the metal powder particles 82 and oxidizer particles 83 of the second explosive layer 86 are illustrated as having larger particle sizes than the metal powder particles 80 and oxidizer particles 81. In FIGS. 11 and 12, the positions of the first explosive loading section 18 and the second explosive loading section 20 are illustrated by dashed lines. Furthermore, FIGS. 11 and 12 show a schematic top view of a platter inside a hard disk. As described below, the positions of the first explosive loading section 18 and the second explosive loading section 20 can be changed to any position, and the number of first explosive loading sections 18 and second explosive loading sections 20 can also be changed. 9 to 12, in order to clearly show the relationship between the platter 53, the first explosive loading section 18, and the second explosive loading section 20, illustrations of components other than the actuator 54 of the hard disk 50 are omitted.

[0055] 4 and 8, at time T0, the ignition device 22 of the information leakage prevention device 1 starts heating the first type explosive layer 84 in the first explosive loading section 18 and the second explosive loading section side first type explosive layer 88 in the second explosive loading section 20. As shown in Fig. 8, the timing at which the ignition device 22 starts heating the second explosive loading section side first type explosive layer 88 is configured to be synchronized with the timing at which the ignition device 22 starts heating the first type explosive layer 84. Therefore, the ignition device 22 heats the first type explosive layer 84 in the first explosive loading section 18 and the second explosive loading section side first type explosive layer 88 in the second explosive loading section 20 at approximately the same time, and combustion starts at time T1. As a result, the first type explosive layer 84 in the first explosive loading section 18 and the second explosive loading section side first type explosive layer 88 in the second explosive loading section 20 start burning at approximately the same time, time T1. The second explosive loading section side first type explosive layer 88 of the second explosive loading section 20 burns out completely and stops burning at time T2, immediately after the circular second opening 56g is formed. After the second explosive loading section side first type explosive layer 88 finishes burning at time T2, the combustion of the first type explosive layer 84 and the second type explosive layer 86 on the first explosive loading section 18 side continues, and air can easily escape from the first explosive loading section 18 toward the second explosive loading section 20 within the relatively sealed space of the hard disk 50. This allows the metal powder particles 82 and oxidizer particles 83 of the second type explosive layer 86 to move more easily within the hard disk 50, and for example, the metal powder particles 82 and oxidizer particles 83 move violently as if burning and causing water vapor on the surface to explode, making it easier to efficiently render a wide area of ​​the platter 53 unusable. Furthermore, compared to when the heating timings of the first type explosive layer 84 and the first type explosive layer 88 on the second explosive loading section side are set separately, a relatively simple configuration can be used to synchronize the timing at which the ignition device 22 starts heating the first type explosive layer 88 on the second explosive loading section side with the timing at which the ignition device 22 starts heating the first type explosive layer 84.

[0056] When the lower part of the first type explosive layer 84 of the first explosive loading section 18 starts to burn, the explosive burns explosively, causing the iron plate of the flat plate 56e (see FIG. 3) on the top surface of the hard disk case 56 to heat to a high temperature of, for example, approximately 2000°C, melt, and then blow away by the blast, forming a first opening 56f. The periphery of the first type explosive layer 84 is also made of metal, but the energy of the combustion of the first type explosive layer 84 is concentrated particularly on the front and lower flat plate 56e, forming a hole. For example, the opening formed in the flat plate 56e is a circular opening and has the same size as the first cylindrical section 40. Similarly, below the second explosive loading section 20, a circular second opening 56g having the same size as the second cylindrical section 44 is formed in the flat plate 56e. 8, the second-explosive-loading-section-side first-type explosive layer 88 of the second explosive loading section 20 burns out completely at time T2 immediately after the second opening 56g is formed in the flat plate 56e, and combustion ends. Because the second-explosive-loading-section-side first-type explosive layer 88 forms the second opening 56g and combustion stops, the second opening 56g can thereafter function as an outlet for gas within the hard disk 50 to flow out. For example, when a gas flow caused by the combustion of explosives is blown into the hard disk 50 through the first opening 56f, the gas within the hard disk 50 can flow out through the second opening 56g. Meanwhile, the first-type explosive layer 84 and the second-type explosive layer 86 of the first explosive loading section 18 continue to burn even after the first opening 56f is formed in the flat plate 56e.

[0057] A first opening 56f is formed by the first explosive layer 84 in the first explosive loading section 18, combustion of the first explosive layer 84 ends, and combustion of the second explosive layer 86 next to the first explosive layer 84 continues. As shown in FIG. 10 , the metal powder particles 82 and the oxidizer particles 83 of the second explosive layer 86 are blown toward the hard disk 50. In terms of the explosive combustion state, the combustion temperature of the second explosive layer 86 is also, for example, about 1000°C to about 2000°C. Furthermore, as the second explosive layer 86 burns, the metal powder particles 82 and the oxidizer particles 83 spread explosively at a speed close to the speed of sound. That is, the metal powder particles 82 and the oxidizer particles 83 of the second explosive layer 86 are introduced toward the hard disk 50 at a relatively high speed. The metal powder particles 82 and oxidizer particles 83 of the second type explosive layer 86 first strike the upper surface of the platter 53 facing the first opening 56f and spread concentrically on the upper surface of the platter 53, making it easy to disable a wide area of ​​the platter 53. The storage area of ​​the platter 53 is disabled by the flames and high-temperature gas flow of the second type explosive layer 86, as well as the heat of the burning metal powder particles 82 and oxidizer particles 83, etc.

[0058] The metal powder particles 82 and the oxidizer particles 83 of the second explosive layer 86 have a second average particle size, which is relatively large. Therefore, after the metal powder particles 82 and the oxidizer particles 83 arrive on the platter 53, the particles tend to move irregularly as they burn. For example, water evaporates on the surfaces of the metal powder particles 82 and the oxidizer particles 83, which have a relatively large diameter, causing the particles to move while lifting them up. As shown in FIG. 11 , the metal powder particles 82 and the oxidizer particles 83 of the second explosive layer 86 tend to move from below the first opening 56f so as to spread across the entire platter 53. In FIG. 11 , the arrows illustrate the irregular movement of the metal powder particles 82 and the oxidizer particles 83 in free directions. Furthermore, the metal powder particles 82 and oxidizer particles 83 of the second explosive layer 86 tend to move downward and behind the platter 53, moving not only to the upper layer but also to the lower layer of the platter 53. This can easily render a wide area of ​​the storage area of ​​the platter 53 unusable as it moves to the corners of the hard disk 50. For example, the metal powder particles 82 and oxidizer particles 83 may combust at high temperatures on the platter 53, causing the platter 53 to burn and collapse. Even if the platter 53 does not burn and collapse, the relatively high-temperature metal powder particles 82 and oxidizer particles 83 may move over a very wide area, making it highly likely that the storage area of ​​the platter 53 will be rendered unusable across most of the area. Needless to say, this makes it difficult to read or restore the data stored in the storage area of ​​the platter 53. As shown by the arrows in Figure 11, the metal powder particles 82 and oxidizer particles 83 burn as they move over the platter 53, efficiently rendering a wider area of ​​the platter 53 unusable. In this way, the burning metal powder particles 82 and oxidizer particles 83 can directly burn the storage area of ​​the platter 53 as they move, rendering it unusable. The flame and the main stream of high-temperature combustion gases associated with the metal powder particles 82 and oxidizer particles 83 can also increase the likelihood that the storage area of ​​the platter 53 will be rendered unusable. Even in areas relatively far from the main stream of flame and high-temperature combustion gases or areas not directly contacted by the metal powder particles 82 and oxidizer particles 83, the heat and other effects of the combustion of the metal powder particles 82 and oxidizer particles 83 can increase the likelihood that the storage area of ​​the platter 53 will be rendered unusable.For example, "unusable" means that the platter 53 cannot be repaired or is rendered unusable to the extent that it requires considerable effort and time to retrieve the information stored therein.

[0059] 8, the combustion of the first and second explosive layers 84 and 86 of the first explosive loading section 18 continues for a certain period of time from time T1 to time T3, and the main stream of the flame and high-temperature combustion gas also continues to flow for a certain period of time. When the combustion of the first and second explosive layers 84 and 86 ends at time T3, the information leakage prevention operation by the information leakage prevention device 1 ends.

[0060] Examples of an embodiment of the present invention may be provided in each aspect as described below.

[0061] (1) An information leakage prevention device for preventing information leakage from a hard disk, the information leakage prevention device comprising: a base body for placing the hard disk on its inner upper surface; a holder arranged so as to contact the upper surface of the hard disk, the holder having a first explosive loading section formed so as to penetrate the inside of the holder from the bottom to the top; a cover arranged so as to cover the top surface of the first explosive loading section of the holder; an ignition device having a heating section; a first type explosive layer arranged within the first explosive loading section, the first type explosive layer having a first average particle size of metal powder particles; and a second type explosive layer arranged within the first explosive loading section in contact with the first type explosive layer, the second type explosive layer having a second average particle size of metal powder particles larger than the first average particle size, the first type explosive layer being arranged closer to the hard disk than the second type explosive layer, and the first type explosive layer being arranged so as to contact the heating section of the ignition device.

[0062] (2) The information leakage prevention device described in (1), wherein the second type explosive layer of the first explosive loading section is arranged above the first type explosive layer of the first explosive loading section.

[0063] (3) The information leakage prevention device described in (1), wherein the second type explosive layer of the first explosive loading section is larger than the first type explosive layer of the first explosive loading section.

[0064] (4) An information leakage prevention device as described in (1), wherein the second amount of explosives in the second type explosive layer of the first explosive loading section is an amount within a range of 2 to 10 times the first amount of explosives in the first type explosive layer of the first explosive loading section.

[0065] (5) The information leakage prevention device according to (1), wherein the second average particle size of the metal powder particles in the second type explosive layer is an average particle size having a value within a range of 0.1 mm to 0.3 mm.

[0066] (6) The information leakage prevention device according to (1), wherein the first average particle size of the metal powder particles in the first type explosive layer is an average particle size having a value within a range of 0.01 mm to 0.03 mm.

[0067] (7) The information leakage prevention device described in (1), wherein the second average particle size of the metal powder particles in the second type explosive layer is a value within a range of 5 to 30 times the first average particle size of the metal powder particles in the first type explosive layer.

[0068] (8) The holder has a second explosives loading section formed to penetrate from the bottom to the top of the holder at a position different from the first explosives loading section, and the second explosives loading section has the first explosives layer without having the second explosives layer, the information leakage prevention device described in (1).

[0069] (9) An information leakage prevention device as described in (8), wherein the first explosives loading section and the second explosives loading section are formed so that the combustion time of the first type explosives layer and the second type explosives layer of the first explosives loading section is longer than the combustion time of the first type explosives layer of the second explosives loading section.

[0070] (10) An information leakage prevention device as described in (8), wherein the first explosives loading section and the second explosives loading section are formed so that the first capacity of the first type explosives layer and the second type explosives layer of the first explosives loading section is greater than the second capacity of the first type explosives layer of the second explosives loading section.

[0071] (11) The information leakage prevention device described in (8), wherein the first explosives loading section and the second explosives loading section are formed so that the placement length of the first type explosives layer and the second type explosives layer placed in the first explosives loading section from the entrance portion of the first explosives loading section is longer than the placement length of the first type explosives layer placed in the second explosives loading section from the entrance portion of the second explosives loading section.

[0072] (12) The information leakage prevention device according to (1), wherein the first type explosive layer is configured in an amount that allows a hole to be drilled in the top plate of the hard disk.

[0073] (13) The information leakage prevention device according to (1), wherein the first explosive loading unit is disposed above the platter of the hard disk.

[0074] (14) The information leakage prevention device according to (1), wherein the first explosive loading unit is disposed above a spindle motor unit of a platter of the hard disk.

[0075] (15) The information leakage prevention device described in (1), wherein the first type explosive layer is configured so that the average particle size of the metal powder particles is the first average particle size and the average particle size of the oxidizer particles is the first average particle size, and the second type explosive layer is configured so that the average particle size of the metal powder particles is the second average particle size and the average particle size of the oxidizer particles is the second average particle size.

[0076] The embodiments for carrying out the present invention are not limited to the above, and other modifications may be applied. Various alternative embodiments and examples will be apparent to those skilled in the art based on the disclosed technology.

[0077] As a modification, as shown in FIG. 12 , the first explosive loading section 18 may be located above the spindle motor section 52. In this case, if the metal powder particles 82 and oxidizer particles 83 of the second explosive layer 86 are introduced from above the spindle motor section 52, i.e., the center of the platter 53, and the metal powder particles 82 and oxidizer particles 83 spread concentrically, the metal powder particles 82 and oxidizer particles 83 can more easily reach the entire area of ​​the platter 53. In other words, the metal powder particles 82 and oxidizer particles 83 can more easily spread throughout the entire platter 53. This allows the distance from the first opening 56f to the farthest part of the platter 53 to be relatively short, increasing the possibility of efficiently disabling the storage area of ​​the platter 53. In this way, the position of the first explosive loading section 18 can be arbitrarily changed.

[0078] As another modification, the diameter of the first explosive loading section 18 may be different from the diameter of the second explosive loading section 20. In this way, for example, the first explosive loading section 18 and the second explosive loading section 20 may be formed so that the second storage capacity E2 of the first type explosive layer 88 on the second explosive loading section side of the second explosive loading section 20 is larger than the first storage capacity E1 of the first type explosive layer 84 and the second type explosive layer 86 of the first explosive loading section 18.

[0079] As yet another modified example, the first explosive loading section 18 and the second explosive loading section 20 may be formed so that the combustion time of the first type explosive layer 88 on the second explosive loading section side of the second explosive loading section 20 is longer than the combustion time of the first type explosive layer 84 and the second type explosive layer 86 of the first explosive loading section 18. For example, the first explosive loading section 18 and the second explosive loading section 20 may be formed so that the second storage capacity E2 of the first type explosive layer 88 on the second explosive loading section side of the second explosive loading section 20 is larger than the first storage capacity E1 of the first type explosive layer 84 and the second type explosive layer 86 of the first explosive loading section 18. For example, the first cylindrical section 40 and the expansion section 42 of the first explosive loading section 18 may be arranged at the position of the second explosive loading section 20, and the second cylindrical section 44 of the second explosive loading section 20 may be arranged at the position of the first explosive loading section 18.

[0080] As another variation, the first type explosive layer 84 and / or the second explosive loading section side first type explosive layer 88 may be formed so that the central portion thereof facing the hard disk 50 is recessed within the first explosive loading section 18 and / or the second explosive loading section 20, respectively. For example, the first type explosive layer 84 and / or the second explosive loading section side first type explosive layer 88 may be formed so that the central portion thereof is recessed in a mortar shape (inverted cone shape). By forming the central portion of the first type explosive layer 84 and / or the second explosive loading section side first type explosive layer 88 to be recessed, when the explosive is ignited, the impact and pressure of the explosion are concentrated at the first opening 56f or the second opening 56g of the hard disk 50 opposite the recessed portion. For example, the first type explosive layer 84 and / or the second explosive loading section side first type explosive layer 88 concentrates the explosion energy on the surface facing the hard disk 50, generating a strong penetration force. This makes it easier to create holes that penetrate the iron plate on the surface of the hard disk 50. As a modified example, the information leakage prevention device 1 may further include a metal liner formed in a cone shape facing upward, which is provided between the hard disk 50 and the first type explosive layer 84 and / or the first type explosive layer 88 on the second explosive loading section side. Such a metal liner is, for example, a metal plate formed in a cone shape. This makes it even easier to create holes that penetrate the iron plate on the surface of the hard disk 50. [Explanation of symbols]

[0081] 1: Information leakage control device 12: Base body 14: Holder 16: Lid 18: First powder loading section 18a: Entrance to the first powder loading section 20: Second powder loading section 20a: Entrance to the second gunpowder loading section 22:Ignition device 22a: Heating part 26: Second powder loading section 50: Hard disk 50a:Top surface 52: Spindle motor section 53: Platter 80: Metal powder particles 81: Oxidizing agent particles 82: Metal powder particles 83: Oxidizing agent particles 84: Type 1 explosive layer 86: Type 2 explosive layer

Claims

1. An information leakage prevention device for preventing information leakage from a hard disk, a base body on which the hard disk is disposed on the inner upper surface; a holder disposed in contact with an upper surface of the hard disk, the holder including a first explosive-loading portion formed inside the holder so as to penetrate from a lower surface to an upper surface; a lid portion provided to cover an upper surface of the first explosive loading portion of the holder; an ignition device having a heating unit; a first type explosive layer provided in the first explosive loading section, the first type explosive layer having metal powder particles with a first average particle size; The metal powder particles have a second average particle size larger than the first average particle size, and a second type explosive layer is provided in the first explosive loading section in contact with the first type explosive layer, An information leakage prevention device, wherein the first type explosive layer is disposed closer to the hard disk than the second type explosive layer, and the first type explosive layer is disposed so as to be in contact with the heating portion of the ignition device.

2. The information leakage suppression device according to claim 1 , wherein the second type explosive layer of the first explosive loading section is disposed above the first type explosive layer of the first explosive loading section.

3. The information leakage prevention device according to claim 1 , wherein the second type explosive layer of the first explosive loading portion is larger than the first type explosive layer of the first explosive loading portion.

4. 2. The information leakage prevention device according to claim 1, wherein the second amount of explosives in the second type explosive layer of the first explosive loading section is an amount within a range of 2 to 10 times the first amount of explosives in the first type explosive layer of the first explosive loading section.

5. 2. The information leakage prevention device according to claim 1, wherein the second average particle size of the metal powder particles in the second explosive layer is an average particle size having a value within a range of 0.1 mm to 0.3 mm.

6. 2. The information leakage prevention device according to claim 1, wherein the first average particle size of the metal powder particles in the first type explosive layer is an average particle size having a value within a range of 0.01 mm to 0.03 mm.

7. 2. The information leakage prevention device according to claim 1, wherein the second average particle size of the metal powder particles in the second type explosive layer is within a range of 5 to 30 times the first average particle size of the metal powder particles in the first type explosive layer.

8. The information leakage prevention device described in claim 1, wherein the holder has a second explosive loading section formed to penetrate from the bottom surface to the top surface of the holder at a position different from the first explosive loading section, and the second explosive loading section has the first explosive layer without having the second explosive layer.

9. 9. The information leakage prevention device according to claim 8, wherein the first explosive loading section and the second explosive loading section are formed so that the combustion time of the first type explosive layer and the second type explosive layer of the first explosive loading section is longer than the combustion time of the first type explosive layer of the second explosive loading section.

10. 9. The information leakage prevention device according to claim 8, wherein the first explosives loading section and the second explosives loading section are formed so that a first capacity of the first type explosive layer and the second type explosive layer of the first explosives loading section is larger than a second capacity of the first type explosive layer of the second explosives loading section.

11. 9. The information leakage prevention device according to claim 8, wherein the first explosives loading section and the second explosives loading section are formed so that the placement length of the first type explosives layer and the second type explosives layer placed within the first explosives loading section from the entrance portion of the first explosives loading section is longer than the placement length of the first type explosives layer placed within the second explosives loading section from the entrance portion of the second explosives loading section.

12. 2. The information leakage prevention device according to claim 1, wherein the first type explosive layer is formed in an amount that allows a hole to be drilled in the top plate of the hard disk.

13. 2. The information leakage prevention device according to claim 1, wherein the first explosive loading unit is disposed above a platter of the hard disk.

14. 2. The information leakage prevention device according to claim 1, wherein the first explosive loading unit is disposed above a spindle motor unit of a platter of the hard disk.

15. the first type explosive layer is configured such that the metal powder particles have an average particle size equal to the first average particle size, and the oxidizer particles have an average particle size equal to the first average particle size, 2. The information leakage prevention device according to claim 1, wherein the second type explosive layer is configured so that the average particle size of the metal powder particles is the second average particle size and the average particle size of the oxidizer particles is the second average particle size.

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