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 base body 12 on which the hard disk is placed on its inner upper surface, a holder 14 arranged to contact the upper surface of the hard disk, the holder comprising a first explosive loading section 18 formed to penetrate from the bottom to the top inside the holder, the first explosive loading section having a first explosive 60 placed inside, and a second explosive loading section 20 provided at a position spaced apart from the first explosive loading section and formed to penetrate from the bottom to the top inside the holder, the second explosive 62 placed inside, a lid section 16 arranged on the top surface of the holder and formed in a flat plate shape, and an ignition device 22 for igniting the first explosive and the second explosive.

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-mentioned 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 to contact the upper surface of the hard disk, the holder comprising: a first explosive loading section formed so as to penetrate from the bottom to the top inside the holder, the first explosive loading section having a first explosive placed inside; a second explosive loading section provided at a position spaced from the first explosive loading section and formed so as to penetrate from the bottom to the top inside the holder, the second explosive loaded section having the second explosive placed inside; a lid section arranged on the top surface of the holder and formed in a flat plate shape; and an ignition device for igniting the first explosive and the second explosive. According to one embodiment of the present invention configured as described above, the holder includes the first explosive loading section for disposing the first explosive and the second explosive loading section for disposing the second explosive, and the first explosive and the second explosive are ignited by an ignition device, thereby opening at least two openings on the top surface of the hard disk. This makes it easier for the flame and the main stream of high-temperature gas accompanying the flame to enter through one opening and exit through the other opening. This makes it easier for the flame and the main stream of high-temperature gas accompanying the flame to flow through the hard disk, making the storage surface of the platter unusable due to the heat of the flame and gas flow, and thus making the information on the hard disk unusable, thereby 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] 4 is a time chart showing the combustion timing of the first explosive in the first explosive loading section and the combustion timing of the second explosive in the second explosive loading section in the information leakage prevention device according to one embodiment of the present invention. [Figure 9] 1 is a schematic diagram illustrating the relationship between a platter of a hard disk and a flame induction region between a first explosive loading section and a second explosive loading section in an information leakage prevention device according to an embodiment of the present invention. FIG. [Figure 10] 1 is a schematic diagram illustrating the relationship between a platter of a hard disk and a flame induction region between a first explosive loading section and a second explosive loading section in an information leakage prevention device according to an embodiment of the present invention. FIG. [Figure 11]1 is a schematic diagram illustrating the relationship between a platter of a hard disk and a flame induction region between a first explosive loading section and a second explosive loading section in an information leakage prevention device according to an embodiment of the present invention. FIG. [Figure 12] 1 is a schematic diagram illustrating the relationship between a platter of a hard disk and a flame induction region between a first explosive loading section and a second explosive loading section in an information leakage prevention device according to an embodiment of the present invention. FIG. [Figure 13] 1 is a schematic diagram illustrating the relationship between a platter of a hard disk and a flame induction region between a first explosive loading section and a second explosive loading section in an information leakage prevention device according to an embodiment of the present invention. FIG. [Figure 14] 1 is a schematic diagram illustrating the relationship between a platter of a hard disk and a flame induction region between a first explosive loading section and a second explosive loading section in an information leakage prevention device according to an embodiment of the present invention. FIG. [Figure 15] 1 is a schematic diagram illustrating the relationship between a platter of a hard disk and a flame induction region between a first explosive loading section and a second explosive loading section in an information leakage prevention device according to an embodiment of the present invention. FIG. 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 hard disk case with a lower portion formed from die-cast aluminum and a 0.3 mm or 0.5 mm steel plate on top. 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 FIGS. 2 and 3, the information leakage prevention device 1 includes a base body 12 having a receiving portion for receiving the hard disk 50, a holder 14, and a cover portion 16.

[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] 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 portion 16 is provided so as to cover the upper surface of the first explosive loading portion 18 and the upper surface of the second explosive loading portion of the holder 14. The lid portion 16 is disposed on the upper surface of the holder 14 and is formed in a flat plate shape. The lid 16 is formed in a rectangular shape when viewed from above, 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 external size of the lid 16 is the same as that of a so-called 3.5-inch standard hard disk drive. The lid 16 forms a flat plate. The lid 16 is made 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 to pass through the holder 14 and fasten to the base body 12, firmly clamping the lid 16, holder 14, and base body 12 together. The thickness (height) of the structure in which these 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 so as to penetrate from the bottom surface to the top surface inside the holder 14. The first explosive loading section 18 is configured to have a first explosive 60 disposed therein. The first explosive 60 can be formed of a common explosive, such as black powder, smokeless powder, or solid propellant. The first explosive 60 is formed, for example, of a flammable rubber base material mixed with an oxidizer or metal particles. In this embodiment, the first explosive 60 has the same basic components as the second explosive 62. The first explosive 60 differs from the second explosive 62 mainly in the position and amount in which it is disposed. 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 section 40 of the first explosive loading section 18 is formed so as to extend linearly from the bottom surface to the top surface of the holder 14. The first explosive loading section 18 is not limited to a cylindrical shape and may have a rectangular cross section or other shapes. The diameter of the first explosive loading section 18 is, for example, within a range of 5 mm to 15 mm, for example, within a range of 5 mm to 10 mm. The vertical length of the first cylindrical section 40 of the first explosive loading section 18 is the same as the vertical length of the second cylindrical section 44 of the second explosive loading section 20. The first explosive loading section 18, for example, the central axis X1 of the first explosive loading section 18, is disposed so as to be perpendicular to the hard disk 50. The central axis X1 of the first cylindrical section 40 is disposed at a position offset from the spindle motor section 52 of the platter 53 of the hard disk 50 in a top view. As a result, the combustion of the explosive in the first explosive loading section 18 causes a flame 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, effectively rendering the data stored on the platter unusable. The cylindrical portion is formed so that additional explosives can be filled inside. The central axis X1 of the first cylindrical portion 40 is positioned, in a top view, at a position offset from the spindle motor portion 52 of the platter of the hard disk 50. This causes the combustion of the explosives in the first explosive loading portion 18 to cause a flame to penetrate into the hard disk 50 at a position offset from the spindle motor portion 52 of the platter, and the main stream of the flame and the high-temperature gases associated with the flame tend to spread concentrically around the lower front portion of the first explosive loading portion 18 and the platter at the lower front portion, effectively rendering the data stored on the platter unusable.

[0029] Burning of the first explosive 60 at the bottom 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 shown by arrow D1. The first explosive loading portion 18 mainly forms a hole in the top surface of the hard disk case 56, but may also make the stored data on some of the platters 53 unusable. The first explosive loading section 18 is located above the end 53d of the platter opposite the actuator side. The first explosive loading section 18 is arranged in a position point-symmetrical with the second explosive loading section 20, with the spindle motor section 52 at the center. In a top view, the distance from the first explosive loading section 18 to the spindle motor section 52 is approximately the same as the distance from the second explosive loading section 20 to the spindle motor section 52. The first explosive loading section 18 can be arranged in any position.

[0030] The extension portion 42 extends laterally from the top of the first cylindrical portion 40. The extension portion 42 extends laterally from the first cylindrical portion 40 by a length, for example, within a range of 10 mm to 30 mm. 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 first explosive 60 can be additionally charged therein in addition to the first cylindrical portion 40. Since the first explosive 60 is additionally charged in the extension portion 42, the first explosive 60 can burn for a longer period of time. The longitudinal length of the extension portion 42 is set to a length within a range of 10 mm to 30 mm. The lateral length of the extension portion 42 is set to a value 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 bend along the way and have an explosive arrangement length, for example, a distance within a range of 10 mm to 50 mm. The explosive arrangement length is the length of the explosive 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 portion 18 is formed so that the first cylindrical portion 40 and the extension portion 42 can store a first storage capacity E1 of explosives. In this way, the first explosive loading section 18 is formed to be able to store a larger volume of explosive than the second explosive loading section 20. The first storage capacity E1 is, for example, the sum of the volume of the first cylindrical section 40 and the volume of the expansion section 42.

[0031] The second explosive loading section 20 is formed inside the holder 14, penetrating from the bottom to the top. The second explosive loading section 20 includes a second cylindrical section 44 formed to extend linearly from the bottom to the top of the holder 14. The second cylindrical section 44 is formed in a cylindrical shape. The second explosive loading section 20 is configured to have a second explosive 62 disposed therein. The second explosive loading section 20 does not include an expansion section that allows additional explosive to be filled therein. The second explosive 62 can be composed of general explosives, such as black powder, smokeless powder, solid propellant, etc. The first explosive 60 is composed, for example, of a flammable rubber base mixed with an oxidizer or metal particles. In this embodiment, the second explosive 62 has the same basic components as the first explosive 60. The first explosive 60 and the second explosive 62 differ mainly in their placement location and amount. The second cylindrical portion 44 is formed 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 rectangular 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 perpendicular to the hard disk 50. The central axis X2 of the second explosive loading portion 20 is disposed parallel to but at a different position from the central axis X1 of the first explosive loading portion 18. The central axis X2 of the second cylindrical portion 44 is disposed at a position offset from the spindle motor unit 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 the combustion of the second explosive in the second cylindrical portion 44, and the flame and high-temperature combustion gases extending from the first explosive loading portion 18 toward the second explosive loading portion 20 extend along the top surface of the platter 53 at a position offset from the spindle motor portion 52 of the platter, effectively rendering the data stored on the platter unusable.

[0032] The combustion of the second explosive 62 at the bottom of 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. 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 62 forms a hole in the top surface of the hard disk case 56, as indicated by arrow D2, but as described below, combustion is terminated early. 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 unit 20 can be positioned anywhere. The second explosive loading section 20 is formed so that a second storage amount E2 of explosive can be stored in the second cylindrical section 44. The second storage amount 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 configured so that the burning time of the first explosive 60 in the first explosive loading section 18 is longer than the burning time of the second explosive 62 in the second explosive loading section 20. As a result, even after the burning of the second explosive 62 in the second explosive loading section 20 has finished, the burning of the first explosive 60 in the first explosive loading section 18 continues, making it easier to set an area within the relatively sealed space of the hard disk 50 to which the main flow of the flame and high-temperature combustion gas flow from the first explosive loading section 18 toward the second explosive loading section 20 is guided. This makes it easier to control the main flow of the flame and high-temperature combustion gas flow within the hard disk 50, making it easier to efficiently disable a wide area of ​​the platter 53.

[0034] Furthermore, for example, the first explosive loading section 18 and the second explosive loading section 20 are formed so that the first storage capacity E1 of the first explosive 60 in the first explosive loading section 18 is larger than the second storage capacity E2 of the second explosive 62 in the second explosive loading section 20. As a result, even after combustion of the second explosive 62 in the second explosive loading section 20 has finished, combustion of the first explosive 60 in the first explosive loading section 18 continues, making it easier to set an area within the relatively sealed space of the hard disk 50 to which the main flow of the flame and high-temperature combustion gas flow from the first explosive loading section 18 toward the second explosive loading section 20 is guided. This makes it easier to control the main flow of the flame and high-temperature combustion gas flow within the hard disk 50, making it easier to efficiently disable a wide area of ​​the platter 53.

[0035] 4, the first explosive loading section 18 and the second explosive loading section 20 are configured so that, for example, the length L1 of the first explosive 60 disposed in the first explosive loading section 18 from the first explosive loading section inlet 18a is longer than the length L2 of the second explosive 62 disposed in the second explosive loading section 20 from the second explosive loading section inlet 20a. The length of the combustion time of the explosive corresponds to the length of the explosive. Therefore, the combustion time of the first explosive 60 is longer than the combustion time of the second explosive 62. As a result, even after the combustion of the second explosive 62 in the second explosive loading section 20 has ended, the combustion of the first explosive 60 in the first explosive loading section 18 continues, making it easier to set an area in the hard disk 50, which is a relatively sealed space, where the main stream of the flame and high-temperature combustion gas flow from the first explosive loading section 18 toward the second explosive loading section 20 is guided. Therefore, the main flow of the flame and high-temperature combustion gases can be more easily controlled within the hard disk 50, making it easier to efficiently disable a wide area of ​​the platter 53.

[0036] 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.

[0037] 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.

[0038] The information leakage prevention device 1 further includes an ignition device 22 that ignites the first explosive 60 and / or the second explosive 62, a second power supply device 24, and an actuation device 30.

[0039] 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.

[0040] 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.

[0041] The ignition device 22 is configured to be able to ignite the first explosive 60 and / or the second explosive 62. The ignition device 22 includes a heating portion 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 portion 22a, the nichrome wire is heated to a high temperature, for example, about 300 to about 400 degrees, thereby igniting the first explosive 60 and / or the second explosive 62. As a modified example, the ignition device 22 may use an ignition ball, and may ignite the ignition ball by passing electricity through the ignition ball, and the first explosive 60 and / or the second explosive 62 may be ignited by the ignition ball.

[0042] The actuation device 30 has a function of controlling, for example, the ignition of the ignition device 22. When an actuation command is received, the ignition device 22 starts energizing the heating unit 22a to ignite the first explosive 60 and / or the second explosive 62. When it determines that an actuation command has not been received, the ignition device 22 is controlled not to energize the heating unit 22a. The actuation 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 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 by wireless communication or the like. The ignition device 22 stores a program that can execute an operation mode in which the ignition device 22 starts energizing the heating unit 22a when an operation command is received, and a program that can execute a non-operation mode in which the ignition device 22 does not start energizing the heating unit 22a when an operation command is not received.

[0043] Next, a method for manufacturing and arranging the information leakage prevention device 1 will be described with reference to FIG.

[0044] 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.

[0045] A first explosive 60 is 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 explosive 60. The ignition device 22 is connected to the heating portion 22a via a power line 22b.

[0046] 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 explosive 60 is loaded in the first explosive loading section 18 and the second explosive 62 is loaded in the second explosive loading section 20, and the lid section 16 is executed, and inserting screws 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 prevention device 1 is placed in a 3.5-inch drive bay 9.

[0047] The electrical wires 32 of the actuator 30 are routed in the appropriate position and the ignition device 22 is placed in a standby state.

[0048] 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.

[0049] First, as shown in Fig. 8, at time T0, the ignition device 22 of the information leakage prevention device 1 starts heating the first explosive 60 in the first explosive loading section 18 and the second explosive 62 in the second explosive loading section 20. The timing at which the ignition device 22 starts heating the second explosive 62 is set to be synchronized with the timing at which the ignition device 22 starts heating the first explosive 60. Therefore, the ignition device 22 heats the first explosive 60 in the first explosive loading section 18 and the second explosive 62 in the second explosive loading section 20 at approximately the same time, and they start burning at time T1. As a result, the first explosive 60 in the first explosive loading section 18 and the second explosive 62 in the second explosive loading section 20 start burning at approximately the same time, time T1. The second explosive 62 in the second explosive loading section 20 burns out completely and stops burning at time T2 immediately after the second opening 56g is formed. After the second explosive 62 stops burning at time T2, the first explosive 60 continues to burn, making it easier to set an area in the relatively sealed space of the hard disk 50 into which the main stream of the flame and high-temperature combustion gas flow from the first explosive loading section 18 toward the second explosive loading section 20 is guided. Furthermore, compared to when the first explosive 60 and the second explosive 62 are heated at separate times, a relatively simple configuration can synchronize the timing at which the ignition device 22 starts heating the second explosive 62 and the timing at which the ignition device 22 starts heating the first explosive 60.

[0050] When the lower portion of the first explosive 60 in the first explosive loading section 18 begins to burn, the explosive burns explosively, heating the iron plate of the flat plate 56e (see FIG. 3) on the top surface of the hard disk case 56 to a high temperature of, for example, approximately 2000°C, and a blast creates a first opening 56f. For example, the opening created in the flat plate 56e is circular 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 created in the flat plate 56e. As shown in FIG. 8, the second explosive 62 in the second explosive loading section 20 burns out immediately after creating the second opening 56g in the flat plate 56e, and combustion ceases. Because the second explosive 62 forms the second opening 56g and ceases to burn, the second opening 56g can then function as an outlet for gas within the hard disk 50. For example, when a gas flow caused by the combustion of explosives is blown into the hard disk 50 from the first opening 56f, the gas inside the hard disk 50 can flow out from the second opening 56g. Meanwhile, the first explosive 60 in the first explosive loading section 18 continues to burn even after the first opening 56f is formed in the flat plate 56e.

[0051] 9 to 15 show a schematic top view of the interior of a hard disk 50, illustrating the positional relationship between a platter 53 of the hard disk 50 and the first and second explosive loading sections 18 and 20. The positions of the first and second explosive loading sections 18 and 20 are illustrated by dashed lines. As described below, the positions of the first and second explosive loading sections 18 and 20 can be changed arbitrarily, and the number of first and second explosive loading sections 18 and 20 can also be changed. To clearly illustrate 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. The arrangement of the first explosive loading section 18 and the second explosive loading section 20 defines a flame induction region 70 extending from the first opening 56f formed by the first explosive 60 in the first explosive loading section 18 to the second opening 56g formed by the explosive in the second explosive loading section 20. The flame induction region 70 is a region defined within the hard disk 50. The flame induction region 70 indicates, for example, the main path through which the flame and the main stream of the high-temperature combustion gas flow pass. As indicated by arrow F1, the flame induction region 70 forms, for example, a band with a width similar to the diameter of the first opening 56f. The flame induction region 70 is defined as the region through which the main flame, etc., flows from the first opening 56f to the second opening 56g when the flame of the explosive and the main stream of the high-temperature combustion gas flow injected from the first opening 56f flow to the second opening 56g as a band-like flow with a width similar to the diameter of the first opening 56f and then exits the second opening 56g. The flame induction region 70 is illustrated, for example, by the dashed line in FIG. Generally, it is difficult to control the position and direction of a flame or a high-temperature gas flow. However, by establishing the flame guidance region 70 extending from the first opening 56f to the second opening 56g, it is possible to easily set and plan the area of ​​the storage area of ​​the platter 53 that is likely to be rendered unusable by the flame and the main stream of the high-temperature combustion gas flow. Furthermore, by establishing the flame guidance region 70, it is possible to easily control the area of ​​the storage area of ​​the platter 53 that is rendered unusable by the flame and the main stream of the high-temperature combustion gas flow. Furthermore, by setting the flame guidance region 70 relatively wide or long on the platter 53, a wide area can be rendered unusable efficiently. The flame guidance region 70 is configured so that its width is the same as or slightly larger than the diameter of the first opening. This allows the width of the flame guidance region 70 to be designed and planned based on the diameter of the first opening 56f. Therefore, it is possible to plan the area of ​​the platter 53 that is rendered unusable.

[0052] As shown in FIG. 9 , the flame guidance region 70 includes a first flame guidance region 71 that extends linearly from the first opening 56f to the second opening 56g on the platter 53 in the hard disk 50. This facilitates determining the position of the flame and the main stream of the combustion gas flow. Furthermore, the flame and the main stream of the combustion gas flow can be set to extend linearly, facilitating smooth flow of the flame and the main stream of the combustion gas. For example, if the bearing above the spindle motor unit 52 is designed to minimize obstruction to the main stream of the flame and the combustion gas flow, the flame and the main stream of the combustion gas can flow linearly beyond the top of the spindle motor unit 52, and the first flame guidance region 71 is formed linearly. Alternatively, as shown in FIG. 11 , the first flame guidance region 71 may be set by positioning the first opening 56f and the second opening 56g so that the line connecting them is outside the spindle motor unit 52. The main stream of the flame and combustion gas flows linearly over the first flame induction region 71 as shown by arrow F3.

[0053] 10, as a modified example, flame guidance region 70 may include a second flame guidance region 72 extending in an arc shape along the circumferential direction of platter 53 from first opening 56f to second opening 56g. For example, if the bearings on the upper part of spindle motor unit 52 are designed to easily obstruct the main flow of the flame and combustion gas, the flame and combustion gas can bypass the upper part of spindle motor unit 52 and flow in an arc shape, as shown by arrow F2, thereby forming second flame guidance region 72. This allows second flame guidance region 72 to be formed in a curved arc shape, making a wide area of ​​platter 53 unusable.

[0054] 12, the flame guidance region 70 includes a third flame guidance region 73 that spreads in a circular shape from the upper surface of the platter 53 below the first opening 56f. The main stream of the flame and combustion gas flowing downward from the first opening 56f toward the upper surface of the platter 53 spreads concentrically on the upper surface of the platter 53 as indicated by arrow F4, forming the third flame guidance region 73, which can render the storage area of ​​the platter 53 unusable by heat. This allows the main stream of the flame and combustion gas flow to spread concentrically on the upper surface of the platter 53, making it easier to render a wide area of ​​the platter 53 unusable.

[0055] As shown in FIG. 13 , the height from the first opening 56f to the top surface of the platter 53 is within a range of 1 mm to 10 mm. Therefore, the flame guidance region 70 includes a fourth flame guidance region 74 extending from the first opening 56f to the second opening 56g along a predetermined height above the top surface of the platter 53, for example, a height within a range of 1 mm to 10 mm from the top surface of the platter 53. At the height of the fourth flame guidance region 74, the main stream of the flame and combustion gas flows, as indicated by arrow F5. By setting the fourth flame guidance region 74 at a height relatively close to the top surface of the platter 53, the storage surface of the platter 53 can be efficiently rendered unusable by the heat of the flame and gas flow in a short period of time. Because the main stream of the flame and combustion gas flows relatively close to the top surface of the platter 53 in the fourth flame guidance region 74, the platter 53 can be easily rendered unusable in a short period of time.

[0056] 14, as a modified example, a plurality of second openings 56g may be provided, and the flame guidance region 70 may include a plurality of fifth flame guidance regions 75 extending from the first opening 56f toward the plurality of second openings 56g. The main stream of the flame and combustion gas flow may be formed as multiple branches, as indicated by arrows F6. This allows the plurality of fifth flame guidance regions 75 to extend, making it possible to efficiently disable a wider area of ​​the platter 53.

[0057] 15, a modified example may include a plurality of second openings 56g, and the flame guidance region 70 may include a sixth flame guidance region 76 that extends from the first opening 56f toward one of the second openings 56g and then branches off toward another second opening 56g. The main stream of the flame and combustion gas flow may initially extend linearly and then branch off, as indicated by arrow F7. This allows the main stream of the flame and combustion gas flow to branch off in a somewhat complex manner, rendering a wide area of ​​the platter 53 unusable. Alternatively, the main stream of the flame and combustion gas flow may branch off midway through the platter 53, rather than branching off below the first opening 56f.

[0058] In this way, the flame and the main stream of high-temperature combustion gas extending from the first explosive 60 of the first explosive loading section 18 are guided along the flame guidance region 70, and the resulting heat burns the storage area of ​​the platter 53, rendering it unusable. The flame and the main stream of high-temperature combustion gas have a temperature of, for example, approximately 2000°C, which increases the likelihood that the storage area of ​​the platter 53 will be unusable in areas relatively close to the flame and the main stream of high-temperature combustion gas. The likelihood that the storage area of ​​the platter 53 will be unusable can also be increased in areas relatively far from the main stream of the flame and the main stream of high-temperature combustion gas. For example, by causing the main stream of flame and high-temperature combustion gas to travel a relatively long distance near the surface of the platter 53, it is possible to easily render a relatively large area of ​​the platter 53 unusable in a short period of time. Note that "unusable" refers to rendering the platter 53 unusable to the extent that repair, such as retrieving the information stored therein, is impossible or requires considerable effort and time.

[0059] The main stream of the flame and high-temperature combustion gas is guided along the flame guide region 70, but some of the branched streams of the flame and high-temperature combustion gas flow below and behind the platter 53. Although the heating performance of the flame and some of the branched streams of high-temperature combustion gas is lower than that of the main stream, they are still capable of disabling the storage area of ​​the platter 53. Therefore, the branched streams of the flame and high-temperature combustion gas flow below and behind the platter 53, disabling not only the upper layer but also the lower layer platters, etc., from the portions exposed to the heat of the flame and high-temperature combustion gas. The flame and combustion gas flowing from the first opening 56f are blown into the hard disk 50 all at once at an extremely high temperature, so the branched streams of the flame and high-temperature combustion gas also heat and disable the storage area of ​​the platter 53. Therefore, even portions not directly hit by the main stream can be disabled by the branched streams.

[0060] The combustion of the first explosive 60 in 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 for a certain period of time. When the combustion of the first explosive 60 ends at time T3, the information leakage prevention operation by the information leakage prevention device 1 ends.

[0061] Examples of an embodiment of the present invention may be provided in each aspect as described below.

[0062] (1) An information leakage prevention device for preventing information leakage from a hard disk, the information leakage prevention device comprising: a base body on which the hard disk is placed on its inner upper surface; a holder arranged to contact the upper surface of the hard disk, the holder comprising: a first explosive loading section formed to penetrate from the bottom to the top inside the holder, the first explosive loading section having a first explosive placed inside; a second explosive loading section provided at a position spaced from the first explosive loading section and formed to penetrate from the bottom to the top inside the holder, the second explosive loaded section having the second explosive placed inside; a cover section arranged on the top surface of the holder and formed in a flat plate shape; and an ignition device for igniting the first explosive and the second explosive.

[0063] (2) The information leakage prevention device described in (1), wherein the first gunpowder loading section and the second gunpowder loading section are formed so that the burning time of the first gunpowder in the first gunpowder loading section is longer than the burning time of the second gunpowder in the second gunpowder loading section.

[0064] (3) The information leakage prevention device described in (1), wherein the first explosive loading section and the second explosive loading section are formed so that the first capacity of the first explosive in the first explosive loading section is greater than the second capacity of the second explosive in the second explosive loading section.

[0065] (4) The information leakage prevention device described in (1), wherein the first explosive loading section and the second explosive loading section are formed so that the placement length from the inlet of the first explosive placed in the first explosive loading section is longer than the placement length from the inlet of the second explosive placed in the second explosive loading section.

[0066] (5) An information leakage prevention device as described in (1), wherein the timing at which the ignition device starts heating the second explosive is synchronized with the timing at which the ignition device starts heating the first explosive.

[0067] (6) An information leakage prevention device as described in (1), in which the arrangement of the first explosives loading section and the second explosives loading section sets a flame induction area extending from a first opening formed by explosives in the first explosives loading section to a second opening formed by explosives in the second explosives loading section.

[0068] (7) The information leakage prevention device described in (6), wherein the flame induction area includes a first flame induction area extending linearly from the first opening to the second opening.

[0069] (8) The information leakage prevention device described in (6), wherein the flame induction area includes a second flame induction area extending in an arc shape along the circumferential direction of the platter from the first opening to the second opening.

[0070] (9) The information leakage prevention device described in (6), wherein the flame induction area includes a third flame induction area that extends circularly from the top surface of the platter below the first opening.

[0071] (10) The information leakage prevention device described in (6), wherein the flame induction area includes a fourth flame induction area extending from the first opening to the second opening along a predetermined height above the top surface of the platter.

[0072] (11) An information leakage prevention device as described in (6), wherein a plurality of the second openings are provided, and the flame induction region includes a plurality of fifth flame induction regions extending from the first opening toward the plurality of second openings.

[0073] (12) An information leakage prevention device as described in (6), in which a plurality of second openings are provided, and the flame induction region includes a sixth flame induction region that extends from the first opening toward one of the second openings and then branches off toward another of the second openings halfway through.

[0074] (13) The information leakage prevention device described in (6), wherein the flame induction area is configured so that the width of the flame induction area is the diameter of the first opening.

[0075] (14) The information leakage prevention device described in (1), wherein the base body with the hard disk placed inside, the holder, and the lid are combined to form a rectangular shape with a depth of 14.6 cm, a width of 10.2 cm, and a height of 2.5 cm.

[0076] (15) The information leakage prevention device according to (1), further comprising a second power supply device that supplies power to the ignition device independently of the power supply device of the personal computer that supplies power to the hard disk.

[0077] (16) The information leakage prevention device according to (1), wherein the base body forms an exhaust passage extending from a space formed between the inner surface of the base body and the hard disk to the outside of the base body.

[0078] 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. As a modified example, 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 capacity of the first explosive 60 in the first explosive loading section 18 is larger than the capacity of the second explosive 62 in the second explosive loading section 20.

[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 second explosive 62 in the second explosive loading section 20 is longer than the combustion time of the first explosive 60 in 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 amount E2 of the second explosive 62 in the second explosive loading section 20 is greater than the first storage amount E1 of the first explosive 60 in 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 explosive 60 and / or the second explosive 62 may be formed so that the central portion 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 explosive 60 and / or the second explosive 62 may be formed so that the central portion is recessed in a mortar shape (inverted cone shape). By forming the central portion of the first explosive 60 and / or the second explosive 62 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 explosive 60 and / or the second explosive 62 concentrates the explosive energy on the surface facing the hard disk 50, generating a strong penetration force. This makes it easier to create a hole that penetrates the steel 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 conical shape facing upward and disposed between the first explosive 60 and / or the second explosive 62 and the hard disk 50. Such a metal liner is, for example, a metal plate formed in a conical shape. This makes it easier to create holes penetrating the iron plate on the surface of the hard disk 50. [Explanation of symbols]

[0081] 1: Information leakage control device 2: PC 12: Base body 12b:Top surface 12c: Exhaust passage 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 24:Second power supply 50: Hard disk 50a:Top surface 53: Platter 56f: 1st opening 56g: 2nd opening 60: First gunpowder 62: Second gunpowder 70: Flame induction area 71: 1st flame induction area 72:Second flame induction area 73:Third flame induction area 74: 4th flame induction area 75: 5th flame induction area 76: 6th flame induction area

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 arranged in contact with an upper surface of the hard disk, the holder comprising: a first explosive loading section formed so as to penetrate from the lower surface to the upper surface inside the holder, the first explosive loading section having a first explosive placed therein; and a second explosive loading section provided at a position separated from the first explosive loading section, the second explosive loading section formed so as to penetrate from the lower surface to the upper surface inside the holder, the second explosive being placed therein; a lid portion disposed on an upper surface of the holder and formed in a flat plate shape; an ignition device that ignites the first explosive and the second explosive.

2. 2. The information leakage prevention device according to claim 1, wherein the first explosive loading section and the second explosive loading section are formed so that the combustion time of the first explosive in the first explosive loading section is longer than the combustion time of the second explosive in the second explosive loading section.

3. 2. The information leakage prevention device according to claim 1, wherein the first explosive loading section and the second explosive loading section are formed so that a first capacity of the first explosive in the first explosive loading section is greater than a second capacity of the second explosive in the second explosive loading section.

4. 2. The information leakage prevention device of claim 1, wherein the first explosive loading section and the second explosive loading section are formed so that the length of the first explosive placed in the first explosive loading section from the inlet of the first explosive loading section is longer than the length of the second explosive placed in the second explosive loading section from the inlet of the second explosive loading section.

5. 2. The information leakage prevention device according to claim 1, wherein a timing at which the ignition device starts heating the second explosive is synchronized with a timing at which the ignition device starts heating the first explosive.

6. 2. The information leakage prevention device of claim 1, wherein the arrangement of the first explosive loading section and the second explosive loading section sets a flame induction area extending from a first opening formed by explosives in the first explosive loading section to a second opening formed by explosives in the second explosive loading section.

7. The information leakage suppression device according to claim 6 , wherein the flame induction region includes a first flame induction region that extends linearly from the first opening to the second opening.

8. 7. The information leakage prevention device according to claim 6, wherein the flame induction region includes a second flame induction region extending in an arc shape along the circumferential direction of the platter from the first opening to the second opening.

9. 7. The information leakage prevention device according to claim 6, wherein the flame induction area includes a third flame induction area that extends in a circular shape from the upper surface of the platter below the first opening.

10. 7. The information leakage prevention device according to claim 6, wherein the flame induction region includes a fourth flame induction region extending from the first opening to the second opening along a predetermined height above the top surface of the platter.

11. A plurality of the second openings are provided, The information leakage suppression device according to claim 6 , wherein the flame induction region includes a plurality of fifth flame induction regions extending from the first opening toward the plurality of second openings.

12. A plurality of the second openings are provided, 7. The information leakage prevention device according to claim 6, wherein the flame induction region includes a sixth flame induction region that extends from the first opening toward one of the second openings and then branches off midway toward another of the second openings.

13. The information leakage prevention device according to claim 6 , wherein the flame induction region is configured so that a width of the flame induction region is equal to a diameter of the first opening.

14. 2. The information leakage prevention device of claim 1, wherein the combination of the base body with the hard disk placed inside, the holder, and the lid forms a rectangular shape with a depth of 14.6 cm, a width of 10.2 cm, and a height of 2.5 cm.

15. 2. The information leakage prevention device according to claim 1, further comprising a second power supply device that supplies power to said ignition device independently of a power supply device of a personal computer that supplies power to said hard disk.

16. 2. The information leakage prevention device according to claim 1, wherein the base body forms an exhaust passage extending from a space formed between an inner surface of the base body and the hard disk to an outside of the base body.

Images