Information leakage suppression device

Abstract

The present invention provides an information leakage suppression device that can render information on a hard disk unusable and suppress the leakage of information from the hard disk. [Solution] The information leakage suppression device 1 comprises a base body 12, a first holder 14 positioned to contact the upper surface of the hard disk 50 and comprising a first nozzle 21 formed to penetrate from the lower surface to the upper surface of the first holder and a second nozzle 23 formed to penetrate from the lower surface to the upper surface of the first holder, a second holder 15 configured as a separate component from the first holder and comprising a first storage section 40 connected to the first upper opening of the first nozzle and a second storage section 41 connected to the second upper opening of the second nozzle, a lid portion 16 formed in the shape of a flat plate, and an ignition device 22, wherein the first holder is formed to be interchangeable with a first holder equipped with first and second nozzles of different shapes.

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 Art

[0002] Recently, various countermeasures have been proposed against information leakage from information in a hard disk. While countermeasures are taken against intrusion from a network into the hard disk, countermeasures against information leakage due to physical theft of a personal computer such as the hard disk being physically stolen together with the personal computer or being taken away forcibly even if theft is noticed have become an issue.

[0003] For example, Patent Document 1 proposes a personal computer theft countermeasure system that locks a hard disk equipped in a personal computer when the personal computer is stolen, using the positional relationship between the personal computer main body and peripheral devices.

Prior Art Documents

Patent Documents

[0004]

Patent Document 1

Summary of the Invention

Problems to be Solved by the Invention

[0005] However, if the personal computer main body is taken away, it may be analyzed over time and there is a risk that internal information will leak.

[0006] In addition, when it is necessary to quickly stop information leakage from a personal computer unavoidably, conventionally, means such as physically destroying it with a hammer or an ax have been used. However, since the hard disk is covered with an aluminum metal die-cast and iron, it is relatively robust, and there are also problems such as the risk of failure to destroy the contents and the time required.

[0007] Therefore, there is a need for stronger and more immediate means of preventing information leaks as a countermeasure against physical theft of personal computers.

[0008] This invention was made to solve these problems and aims to provide an information leakage suppression device that can render information on a hard disk unusable and suppress the leakage of information from a hard disk. [Means for solving the problem]

[0009] To achieve the above objective, according to one embodiment of the present invention, an information leakage suppression device for suppressing information leakage from a hard disk comprises: a base body on which the hard disk is placed on the inner upper surface; a first holder disposed in contact with the upper surface of the hard disk, comprising a first nozzle formed to penetrate from the bottom surface to the top surface inside the first holder and having explosives placed inside; and a second nozzle formed to penetrate from the bottom surface to the top surface inside the first holder and having the explosives placed inside; a second holder disposed in contact with the upper surface of the first holder and configured as a separate member from the first holder, comprising a first storage portion connected to a first upper opening of the first nozzle and a second storage portion connected to a second upper opening of the second nozzle; a lid portion disposed in contact with the upper surface of the second holder and formed in a flat plate shape; and an ignition device for igniting the explosives in the first nozzle and the explosives in the second nozzle, wherein the first holder is formed to be interchangeable with the first holder having the first nozzle and second nozzle of different shapes. According to the embodiment of the present invention configured in this manner, the first holder is configured as a separate component from the second holder, and the first holder is interchangeable separately from the second holder. Furthermore, the first holder is formed to be interchangeable with the first holder equipped with the first nozzle and the second nozzle of different shapes. This makes it easier to change the design of the first nozzle 21 and / or the second nozzle 23, enabling combustion tailored to the hard disk. Thus, information on the hard disk can be rendered unusable, and information leakage from the hard disk can be suppressed. For example, it is possible to easily render information on hard disks of various models unusable, and information leakage from hard disks can be suppressed. [Effects of the Invention]

[0010] According to the information leakage suppression device of the present invention, information stored on a hard disk can be rendered unusable, thereby suppressing information leakage from the hard disk. [Brief explanation of the drawing]

[0011] [Figure 1] This is a side view showing the internal structure inside the case of a personal computer equipped with an information leakage suppression device according to one embodiment of the present invention, with the side panel removed. [Figure 2] This is a schematic perspective view of an information leakage prevention device according to one embodiment of the present invention. [Figure 3] This is an exploded perspective view of an information leakage prevention device according to one embodiment of the present invention. [Figure 4] This is a cross-sectional view of an information leakage suppression device according to one embodiment of the present invention, taken along the line IV-IV in Figure 3. [Figure 5] This is a cross-sectional view along the line V-V in Figure 4 of an information leakage suppression device according to one embodiment of the present invention. [Figure 6] This is a cross-sectional view of an information leakage suppression device according to one embodiment of the present invention, taken along the line VI-VI in Figure 2. [Figure 7] Figure 4 shows a magnified view of the area around the hard disk, and is a schematic diagram illustrating the internal structure of the hard disk and its relationship to the first holder. [Figure 8] This is an exploded perspective view showing an example of applying a first holder of a different shape to an information leakage suppression device according to one embodiment of the present invention. [Figure 9] This is a block diagram showing the configuration of an information leakage prevention device according to one embodiment of the present invention. [Figure 10] This is a time chart showing the combustion timing of the first explosive in the first nozzle and the combustion timing of the second explosive in the second nozzle in an information leakage suppression device according to one embodiment of the present invention. [Figure 11] This is a schematic diagram illustrating the relationship between the hard disk platter and the flame induction region between the first nozzle and the second nozzle in an information leakage suppression device according to one embodiment of the present invention. [Figure 12] This is a schematic diagram illustrating the relationship between the hard disk platter and the flame induction region between the first nozzle and the second nozzle in an information leakage suppression device according to one embodiment of the present invention. [Modes for carrying out the invention]

[0012] The following describes an information leakage suppression device 1 according to one embodiment of the present invention, with reference to the attached drawings. The embodiments described herein are illustrative and will be apparent to those skilled in the art that many modifications, changes, and substitutions are possible within the spirit and scope of the present invention. Therefore, the present invention is not limited to the embodiments disclosed, and various modifications, changes, etc., are possible in its form and details without departing from 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 an 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 that destroys the hard disk so that the information in the hard disk 50 (see FIG. 9) becomes unusable. For example, when the hard disk is about to be forcibly removed or has been removed together with the personal computer, the information in the hard disk can be made unusable immediately by igniting gunpowder in a short period of about several seconds, and the information leakage from the hard disk can be suppressed. The hard disk 50 generally has a lower part of the hard disk case formed of aluminum die-casting and an iron plate of 0.3 mm or 0.5 mm etc. arranged on the upper part. Therefore, it also has a characteristic that it is relatively hard and difficult to break even if one tries to physically break it. Hereinafter, in the description of an embodiment of the present invention, as shown in FIG. 2, one longitudinal direction of the information leakage prevention device 1 is defined as the front side, the opposite side as the rear side, the right hand side as the right side and the left hand side as the left side in a state facing the front side of the information leakage prevention device 1, the upper side of the information leakage prevention device 1 as the upper side, and the lower side as the lower side for explanation.

[0014] As shown in Figure 1, the information leakage suppression device 1 is placed inside the case 3 of a personal computer (PC) 2. PC 2 is, for example, a stationary PC placed on an office desk. The case 3 is box-shaped; Figure 1 shows the case 3 with its side panel removed to reveal its internal structure. PC 2 comprises a motherboard 6 on which the CPU and memory are located, a first power supply unit 7 that supplies power to the motherboard 6 and the hard disk 50 (see Figure 3), the hard disk 50, and the information leakage suppression device 1. The information leakage suppression device 1 has a hard disk 50 built inside and, as will be described later, is formed to be roughly the same size as a standard 3.5-inch hard disk drive. Therefore, the information leakage suppression device 1 can be relatively easily housed in a 3.5-inch drive bay 9 inside the case 3 of a commercially available PC 2. As shown in Figure 1, multiple 3.5-inch drive bays 9 are formed inside the case 3. A user can, for example, add hard disks or the like by fixing them into such 3.5-inch drive bays 9. Case 3 also contains cooling fans 11, etc. The internal structure of a typical personal computer 2 will not be explained.

[0015] As shown in Figures 2 and 3, the information leakage suppression device 1 comprises a base body 12 having a receiving portion for receiving the hard disk 50, a first holder 14, a second holder 15, and a lid portion 16.

[0016] As shown in FIG. 3, the base body 12 arranges the hard disk 50 on the inner upper surface. The base body 12 is formed in a rectangular shape when viewed from above, forming a rectangle with a length (depth) of 14.6 cm in the front-rear direction and a length (width) of 10.2 cm in the left-right direction. The outer size of the base body 12 is the same as the outer size of a so-called 3.5-inch standard hard disk drive. The base body 12 is formed such that the outer peripheral portion rises with respect to the flat base portion, and the central portion forms a recessed portion 12a. 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 standard hard disk drive. The recessed portion 12a is formed such that a slight gap space is formed outside in a state where a so-called 2.5-inch standard hard disk drive is arranged inside. The bottom surface of the recessed portion 12a is flat and formed in a rectangular shape. In a state where a so-called 2.5-inch standard hard disk drive is arranged inside, the upper surface 50a of the hard disk 50 and the upper surface 12b of the outer peripheral portion of the base body 12 are formed to be of the same height. Therefore, the first holder 14 and the base body 12 can be combined in a state where the first holder 14 is in contact with both the upper surface 50a of the hard disk 50 and the upper surface 12b of the base body 12. By forming it in this way, a commercially available high-performance so-called 2.5-inch standard hard disk drive is used, and as a whole, the information leakage prevention device 1 has the same outer size as a so-called 3.5-inch standard hard disk drive and can be arranged in a hard disk storage slot of a general personal computer. Note that since the lid portion 16 and the base body 12 are fastened with one screw and penetrate through the first holder 14 and the second holder 15, it is possible to configure the information leakage prevention device 1 even if the size of the hard disk drive received in the recessed portion is somewhat different. Note that the size and shape of the information leakage prevention device 1 are not limited to the same outer size as a 3.5-inch standard hard disk drive and may be formed in any size and shape. When the overall size of the information leakage prevention device 1 changes, the convenience for arranging in a personal computer decreases, but the information leakage prevention device 1 still exhibits a certain effect.

[0017] The base body 12 is made of a stainless steel metal component. The base body 12 forms an exhaust passage 12c that extends 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. The formation of the exhaust passage 12c prevents the expanded gas from being exhausted through the exhaust passage 12c when the gunpowder burns explosively, thus preventing the base body 12, the first holder 14, the second holder 15, and the lid 16 from exploding and damaging surrounding objects.

[0018] As shown in Figure 7, the hard disk 50, which is placed on the base body 12, will be described below. The hard disk 50 is, for example, a so-called 2.5-inch standard hard disk 50 device. The hard disk 50 generally comprises a hard disk structure 51 whose lower part is made of die-cast aluminum, a spindle motor unit 52, a platter 53, an actuator 54, a magnetic head 55, and a hard disk case 56, all of which are arranged on the hard disk structure 51.

[0019] The hard disk structure 51 is provided at the base of the hard disk 50. The spindle motor section 52, actuator 54, etc. are attached to the upper side 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 constitutes the lower part of the hard disk case 56 and is fixed to the hard disk case 56 around its outer circumference. The lower part of the hard disk structure 51 is made of a metal member, such as aluminum die-cast.

[0020] The spindle motor section 52 is formed to rise vertically from the hard disk structure 51. The spindle motor section 52 is cylindrical in shape. The spindle motor section 52 houses a spindle motor and is configured to rotate the platters 53 around the spindle motor section 52 in response to the rotation of the spindle motor. The inner circumference of the platters 53 is connected to the outer circumference of the spindle motor section 52. For example, four platters 53 are connected to the spindle motor section 52 in a vertically aligned configuration. The spindle motor section 52 is configured to rotate at a predetermined rotational speed.

[0021] The platter 53 is formed on a disk. The platter 53 is formed on a thin flat plate. The platter 53 is formed in a circular shape of a predetermined diameter when viewed from above. The platter 53 has a storage area on its upper surface and is configured to store a large amount of data. The platter 53 has a layer of magnetic material for recording on its upper surface. The platter 53 is connected to the spindle motor unit 52 at its center. This is configured so that the platter 53 rotates in conjunction with the rotation of the spindle motor unit 52. The magnetic head 55 moves onto the platter 53 so that the magnetic head 55 can read the information stored on the platter 53. The platter 53 is formed by, for example, four platters 53, and the four platters 53 are arranged vertically. The storage layer and magnetic layer of the platter 53 constitute a delicate storage area and are susceptible to serious damage that renders them unusable even by slight heat or dirt such as soot.

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

[0023] The magnetic head 55 is located inside the hard disk case 56. The magnetic head 55 has a fork-shaped data reading section. Initially, the magnetic head 55 is located outside the platter 53. When reading data, the magnetic head 55 is positioned on the platter 53 by the actuator 54. The magnetic head 55 has the function of writing data to the platter 53 and reading data from the platter 53.

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

[0025] Next, as shown in Figure 3, the first holder 14 is positioned so as to be in contact with the top surface of the hard disk 50. When viewed from above, the first holder 14 is formed in a rectangular shape, with a length (depth) of 14.6 cm in the front-to-back direction and a length (width) of 10.2 cm in the left-to-right direction. The external dimensions of the first holder 14 are the same as those of a so-called 3.5-inch standard hard disk drive. The first holder 14 forms a flat plate. The first holder 14 is made of a stainless steel metal component.

[0026] The first holder 14 includes a first nozzle 21 and a second nozzle 23. As shown in Figure 5, the first nozzle 21 is formed to penetrate from the lower surface 14a to the upper surface 14b inside the first holder 14 and contains explosives. The first nozzle 21 is formed in a cylindrical shape. The first nozzle 21 is formed as an opening in the metal plate of the first holder 14. The first nozzle 21 extends linearly so as to penetrate from the lower surface to the upper surface of the first holder 14. The first lower opening of the first nozzle 21 is formed on the lower surface of the first holder 14. The first upper opening of the first nozzle 21 is formed on the upper surface of the first holder 14. The first nozzle 21 is not limited to a cylinder and may be formed in a square cross-section or other shapes. The diameter of the first nozzle 21 is, for example, a value in the range of 5 mm to 15 mm, for example, a value in the range of 5 mm to 10 mm, and for example, a value in the range of 5 mm to 8 mm. The diameter of the horizontal cross-section of the first nozzle 21 is constant from the bottom to the top of the first nozzle 21. The vertical length of the first nozzle 21 is the same as the vertical length of the second nozzle 23. The first nozzle 21 is positioned spaced apart from the second nozzle 23 and is located below one end of the first storage section 40. This allows for efficient use of the storage area for the first explosive 60 in the first storage section 40 even if the first nozzle and / or the second nozzle are changed to other types. This also allows for efficient use of the storage area for the second explosive 62 in the second storage section. Therefore, it is easier to ensure a degree of freedom in adjusting the burning time of the first explosive 60 and the second explosive 62.

[0027] Furthermore, for example, the central axis X1 of the first nozzle 21 is positioned perpendicular to the hard disk 50. In a top view, the central axis X1 of the first nozzle 21 is positioned offset from the spindle motor section 52 of the platter 53 of the hard disk 50. As a result, the combustion of the gunpowder in the first nozzle 21 causes the flame to enter the hard disk 50 at a position offset from the spindle motor section 52 of the platter, as shown by arrow D1 (see Figure 7), thereby efficiently rendering the stored data on the platter unusable. The first storage section 40 is formed so that additional first gunpowder 60 can be filled inside. The central axis X1 of the first nozzle 21 is positioned offset from the spindle motor section 52 of the platter of the hard disk 50 when viewed from above. This ensures that the combustion of the first explosive 60 in the first nozzle 21 causes the flame to enter the hard disk 50 at a position offset from the spindle motor section 52 of the platter. This allows the flame and the main stream of high-temperature gas associated with the flame to spread concentrically around the lower front portion of the first nozzle 21 and the platter in the lower front portion, effectively rendering the stored data on the platter unusable. The first nozzle 21 is configured to contain the first explosive 60. The first explosive 60 can be made from a general explosive, such as black powder, smokeless powder, or solid propellant. For example, the first explosive 60 may be made from a mixture of a flammable rubber base material with an oxidizing agent or metal particles. In this embodiment, the first explosive 60 has the same basic components as the second explosive 62. The first explosive charge 60 differs from the second explosive charge 62 mainly in its placement and quantity.

[0028] The length of the explosive arrangement is the length of the first explosive 60 arranged from the inlet at the lower end of the first nozzle 21 to the top of the first nozzle 21, and to the end of the first storage section 40 opposite to the first nozzle 21. The first nozzle 21 and the first storage section 40 are formed to accommodate an explosive of a first capacity E1. The first capacity E1 is, for example, the sum of the volumes of the first nozzle 21 and the first storage section 40. The first capacity E1 is larger than the second capacity E2, which will be described later.

[0029] The combustion of the first gunpowder 60 at the bottom of the first nozzle 21 can form a hole in the upper surface of the hard disk case 56, as shown by arrow D1 (see Figure 7). The first nozzle 21 mainly forms a hole in the upper surface of the hard disk case 56, but it may also render some of the stored data on the platter 53 unusable. The first nozzle 21 is located above the end 53d of the platter opposite to the actuator side. The first nozzle 21 is positioned point-symmetrically with respect to the second nozzle 23 with respect to the spindle motor section 52. In a top view, the distance from the first nozzle 21 to the spindle motor section 52 is approximately the same as the distance from the second nozzle 23 to the spindle motor section 52. The first nozzle 21 can be positioned at any location. Note that the internal structure of the hard disk 50 is omitted from the illustration in Figures 4 and 5.

[0030] As shown in Figure 4, the second nozzle 23 is formed to penetrate the inside of the first holder 14 from the bottom surface 14a (see Figure 5) to the top surface 14b, and the second explosive 62 is placed inside it. The second nozzle 23 has basically the same shape as the first nozzle 21, but is located in a different position. The second nozzle 23 is formed in a cylindrical shape. The second nozzle 23 is formed as an opening in the metal plate of the first holder 14. The second nozzle 23 extends linearly so as to penetrate from the bottom surface 14a to the top surface 14b of the first holder 14. The second lower opening of the second nozzle 23 is formed on the bottom surface of the first holder 14. The second upper opening of the second nozzle 23 is formed on the top surface of the first holder 14. The second nozzle 23 is not limited to a cylinder and may be formed in a square cross-section or other shapes. The diameter of the second nozzle 23 is, for example, a value in the range of 5 mm to 15 mm, or for example, a diameter in the range of 5 mm to 10 mm. The diameter of the horizontal cross-section of the second nozzle 23 is constant from the bottom to the top of the second nozzle 23. The vertical length of the second nozzle 23 is the same as the vertical length of the first nozzle 21. The second nozzle 23 is positioned spaced apart from the first nozzle 21 and is located below one end of the second storage section. This allows for efficient use of the storage area for the first explosive 60 in the first storage section 40 even if the first nozzle and / or the second nozzle are changed to different ones. This also allows for efficient use of the storage area for the second explosive 62 in the second storage section 41. Therefore, it is easier to ensure a degree of freedom in adjusting the burning time of the first explosive 60 and the second explosive 62.

[0031] Furthermore, for example, the central axis X2 of the second nozzle 23 is positioned perpendicular to the hard disk 50. The central axis X2 of the second nozzle 23 is positioned parallel to and at a different position from the central axis X1 of the first nozzle 21. In a top view, the central axis X2 of the second nozzle 23 is positioned offset from the spindle motor section 52 of the platter of the hard disk 50. As a result, the combustion of the second gunpowder in the second nozzle 23 forms an opening offset from the spindle motor section 52 of the platter, and the flame and high-temperature combustion gases extending from the first nozzle 21 toward the second nozzle 23 extend along the upper surface of the platter 53 at the offset position from the spindle motor section 52 of the platter, thereby efficiently rendering the stored data on the platter unusable.

[0032] The combustion of the second explosive 62 at the bottom of the second nozzle 23 can form a hole in the upper surface of the hard disk case 56, as shown by arrow D2. The second nozzle 23 mainly forms a hole in the upper surface of the hard disk case 56, but may render some of the stored data on the platter 53 unusable. The second explosive 62 forms a hole in the upper surface of the hard disk case 56, as shown by arrow D2, but the combustion ends early, as will be described later. The second nozzle 23 is located above the actuator-side end 53c of the platter 53, as shown in Figure 7. The second nozzle 23 is positioned point-symmetrically with respect to the first nozzle 21 with respect to the spindle motor section 52. In a top view, the distance from the first nozzle 21 to the spindle motor section 52 is approximately the same as the distance from the second nozzle 23 to the spindle motor section 52. The second nozzle 23 can be positioned at any location. The second nozzle 23 and the second storage section 41 are formed to accommodate explosives with a second storage capacity E2. The second capacity E2 is, for example, the volume of the second nozzle 23 and the second storage section 41.

[0033] The second holder 15 is positioned so as to be in contact with the top surface of the first holder 14. When viewed from above, the second holder 15 is formed in a rectangular shape, with a length (depth) of 14.6 cm in the front-to-back direction and a length (width) of 10.2 cm in the left-to-right direction. The external dimensions of the second holder 15 are the same as those of a so-called 3.5-inch standard hard disk drive. The height of the second holder 15 is within the range of 5 mm to 25 mm. The second holder 15 forms a flat plate. The second holder 15 is made of a stainless steel metal component.

[0034] The second holder 15 includes a first storage section 40 connected to the first upper opening of the first nozzle 21 and a second storage section 41 connected to the second upper opening of the second nozzle 23.

[0035] The first storage section 40 forms a first opening that extends laterally from above the first nozzle 21. Because the first storage section 40 forms a laterally extending opening, it is possible to easily expand the storage area for explosives in addition to the first nozzle 21 even if the position of the first nozzle 21 is changed. Furthermore, the first storage section 40 can be easily applied when using the first nozzle 21 with its position changed laterally. The first storage section 40 forms a groove. Therefore, the first nozzle 21 and the first storage section 40 form an L-shaped storage section. The first storage section 40 is formed to extend linearly in the horizontal direction. The lower end of the opening of the first storage section 40 is formed on the lower surface of the second holder 15. The upper end of the opening of the first storage section 40 is formed on the upper surface of the second holder 15. The first storage section 40 forms a through hole that extends from the upper surface to the lower surface of the second holder 15. The first storage section 40 is formed to extend linearly from the lower surface to the upper surface of the second holder 15. The first storage section 40 extends along the longitudinal direction of the second holder 15. When viewed from above, the first storage section 40 forms a substantially rectangular groove. When viewed from above, one end of the first storage section 40 has an arc-shaped end that matches the first upper opening of the first nozzle. When viewed from above, the other end of the first storage section 40 also has an arc-shaped end. The longitudinal length of the first storage section 40 is, for example, within the range of 10 mm to 30 mm. The transverse length (width) of the first storage section 40 is within the range of 5 mm to 20 mm. The height of the first storage section 40 is the same as the height of the second holder 15. The first upper opening of the first nozzle 21 is connected to one end of the first opening of the first storage section 40. The central axis of the arc at one end of the first storage section 40 extends so as to coincide with the central axis X1 of the first nozzle 21.

[0036] The first storage section 40 is formed to accommodate explosives within the storage section by the structure described above. The first storage section 40 is formed to extend the explosive storage area in addition to that of the first nozzle 21. The first storage section 40 is formed to allow for additional explosives to be filled inside in addition to that of the first nozzle 21. The opening of the first storage section 40 is filled with the first explosive 60, and the combustion state of the first explosive 60 from the first nozzle 21 continues for a relatively long period. The first nozzle 21 and the first storage section 40 have an explosive arrangement length of a distance between them, for example, 10 mm to 50 mm, with a bend along the way. The first nozzle 21 and the first storage section 40 are formed to accommodate a first storage volume E1 of explosives. The first storage volume E1 is, for example, the sum of the volume of the first nozzle 21 and the volume of the first storage section 402.

[0037] The second storage section 41 is formed by a second opening that extends laterally. Because the second storage section 41 has a laterally extending opening, it is possible to easily expand the storage area for explosives in addition to the second nozzle 23 even when the position of the second nozzle 23 is changed. Also, the second storage section 41 can be easily applied when using the second nozzle 23 with its position changed laterally. The second storage section 41 has a groove. The second storage section 41 is formed to extend linearly in the horizontal direction. The first opening and the second opening are arranged in parallel. Because the first storage section 40 and the second storage section 41 are arranged in parallel, it is possible to secure the storage capacity of the first nozzle 21 and the first storage section 40 for the first explosive 60, as well as the storage capacity of the second nozzle 23 and the second storage section 41 for the second explosive 62, within a relatively narrow area. Furthermore, for example, when applying a first holder 14 with altered positions of the first nozzle 21 and the second nozzle 23, by arranging the first storage section 40 and the second storage section 41 in parallel, it is not necessarily required to arrange them symmetrically. However, if it is desired to arrange them symmetrically with respect to the center of the platter, etc., the positions can be easily changed to paired positions to facilitate symmetrical arrangement.

[0038] The second storage section 41 has basically the same shape as the first storage section 40, but is located in a different position. The lower end of the opening of the second storage section 41 is formed on the lower surface of the second holder 15. The upper end of the opening of the second storage section 41 is formed on the upper surface of the second holder 15. The second storage section 41 forms a through hole that extends from the upper surface to the lower surface of the second holder 15. The second storage section 41 is formed to extend linearly from the lower surface to the upper surface of the second holder 15. The second storage section 41 extends along the longitudinal direction of the second holder 15. When viewed from above, the second storage section 41 forms a roughly rectangular groove. When viewed from above, one end of the second storage section 41 has an arc-shaped end that matches the second upper opening of the second nozzle. When viewed from above, the other end of the second storage section 41 also has an arc-shaped end. The longitudinal length of the second storage section 41 is, for example, within the range of 2 cm to 10 cm. The transverse length (width) of the second storage section 41 is within the range of 0.5 cm to 1 cm. The height of the second storage section is the same as the height of the second holder 15. The second upper opening of the second nozzle is connected to one end of the second opening of the second storage section. The central axis of the arc at one end of the second opening is equal to the central axis X2 of the second nozzle 23.

[0039] The second storage section 41 is formed to accommodate the second explosive 62 within the storage section by the structure described above. The second storage section 41 is formed to extend the explosive storage area in addition to the second nozzle 23. The opening of the second storage section 41 is filled with the second explosive 62, and the combustion state of the second explosive 62 from the second nozzle 23 continues for a relatively long time. The second storage section 41 is equipped with a spacer member 43 (see Figure 4), such as a graphite member, which fills a part of the storage area within the second storage section 41, and is formed to adjust the amount of explosive stored in the second storage section. The spacer member 43 is made of a material that is difficult to burn, and is arranged so that the amount of second explosive 62 in the second storage section 41 is less than the first storage amount E1. Thus, it is also possible to freely arrange the spacer member 43 within the first storage section 40 and / or the second storage section 41. By placing the spacer member 43 in the first storage section 40 and / or the second storage section 41, it becomes easier to ensure a degree of freedom in adjusting the burning time of the first explosive 60 and the second explosive 62. Furthermore, for example, by placing the spacer member 43 in the second storage section 41 and setting the burning time on the second nozzle 23 side to be shorter, it becomes possible to change the meaning of the action of the second nozzle 23, such as the second nozzle 23 forming a hole in the upper surface of the hard disk case 56 and ending its burning. Therefore, the burning time and burning action can be changed without having to remake the first storage section 40 and / or the second storage section 41.

[0040] The first holder 14 is separated from the second holder 15 and formed as a separate component. This makes the first holder 14 replaceable independently of the second holder 15. As shown in Figure 8, the first holder 14 equipped with first nozzles 21 and 23 of different diameters C2 can be replaced from the first holder 14 equipped with first nozzles 21 and 23 of a predetermined diameter C1. By installing the first holder 14 equipped with first nozzles 21 and 23 of different diameters C2, the combustion effect on the hard disk 50, such as penetration force, combustion time, and combustion pressure, can be adjusted. For example, if the diameter C2 of the first nozzle 21 of the first holder 14 is made smaller than the predetermined diameter C1, the penetration force on the hard disk 50 can be increased. For example, in models where the metal constituting the hard disk case 56 is robust, forming the diameter of the first nozzle 21 slightly smaller makes it easier to form a hole in the top surface of the hard disk case 56. Conversely, if the diameter of the first nozzle 21 is made relatively large, the stability of combustion can be improved, and combustion burning inside the hard disk 50 can be carried out relatively stably. Another modification is to make the diameter of the second nozzle 23 smaller than the diameter of the first nozzle 21, so that the opening of the hard disk case 56 on the second nozzle 23 side can be reliably formed in a short period of time. By making the first holder 14 replaceable, the design of the first nozzle 21 and / or the second nozzle 23 can be changed to enable combustion that matches the hard disk 50.

[0041] As a further modification, the position of the first nozzle 21 and / or the second nozzle 23 can be changed by making the first holder 14 replaceable. Depending on the type and model of the target hard disk 50, there may be a need to adjust the position of the first nozzle 21 and / or the second nozzle 23. In such cases, the first holder 14 can be made replaceable without having to rebuild the entire information leakage suppression device 1. In the modified first holder 14, the position of the first nozzle 21 may also be changed. By changing the position of the first nozzle 21, the position from which the flame is blown onto the hard disk 50 can be changed. In this way, it is possible to arrange the first holder 14 having different first nozzles 21 and / or second nozzles 23.

[0042] Furthermore, the second holder 15 is formed with relatively long first storage section 40 and second storage section 41, allowing for adjustment of the explosive burning time. For example, by placing a spacer member 43 that is difficult to burn in the second storage section 41, the burning time of the second explosive 62 in the second storage section 41 can be slightly shortened. On the second nozzle 23 side, the second explosive 62 in the second nozzle 23 can burn out completely and cease burning as soon as it forms the second opening 56g. In contrast, if the second explosive 62 is completely filled into the second storage section 41 without placing a spacer member 43, a strong burning flame can be blown into the hard disk 50 from the second nozzle 23 side, causing the inside to burn in a short period of time. In this way, the design of the second holder 15 can be easily modified independently of the first holder 14.

[0043] The second holder 15 is separated from the first holder 14 and formed as a separate component. This makes the second holder 15 replaceable independently of the first holder 14. Therefore, as described above, it becomes easier to make changes to the second holder 15, such as arranging the spacer member 43. Also, since the second holder 15 can be attached to different first holders 14, various information leakage suppression devices 1 with different combustion performance and combustion action of the first nozzle 21 and the second nozzle 23 can be formed by combining the first holder 14 and the second holder 15. Therefore, it becomes relatively easy to provide variations of the information leakage suppression device 1. The hard disks 50 that are to be destroyed are currently sold by various manufacturers in various models, and the metal and strength of the hard disk cases 56 also differ. Therefore, by making it easy to provide information leakage suppression devices 1 with different combustion performance and combustion action of the first nozzle 21 and the second nozzle 23, it is advantageous that users who intend to use this device can easily select the appropriate performance.

[0044] The lid portion 16 is positioned so as to be in contact with the upper surface of the second holder 15. The lid portion 16 is formed in a flat plate shape. The lid portion 16 is formed to cover the first storage portion 40 of the second holder 15 and also to cover the second storage portion 41. When viewed from above, the lid portion 16 is formed in a rectangular shape, with a length (depth) of 14.6 cm in the front-to-back direction and a length (width) of 10.2 cm in the left-to-right direction. The external dimensions of the lid portion 16 are the same as those of a so-called 3.5-inch standard hard disk drive. The lid portion 16 is formed in a flat plate shape. The lid portion 16 is made of stainless steel metal. Screw holes are formed near the four corners of the lid portion 16, and screws are inserted into each of them, passing through the first holder 14 and the second holder 15 and fastening them to the base body 12, firmly fastening the lid portion 16, the first holder 14, the second holder 15 and the base body 12 together. The combined thickness (height H) of this structure is 2.5 cm.

[0045] For example, the amount of first explosive 61 in the first storage compartment 40 is greater than the amount of second explosive 62 in the second storage compartment 41, so that the burning time of the first explosive 60 in the first nozzle 21 and the first storage compartment 40 is longer than the burning time of the second explosive 62 in the second nozzle 23 and the second storage compartment 41. As a result, even after the burning of the second explosive 62 in the second nozzle 23 has finished, the burning of the first explosive 60 in the first nozzle 21 continues, making it easier to set up a region within the relatively sealed space of the hard disk 50 where the main flow of flame and high-temperature combustion gas is induced from the first nozzle 21 to the second nozzle 23. Therefore, the main flow of flame and high-temperature combustion gas is easier to control within the hard disk 50, making it easier to efficiently render a wide area of ​​the platter 53 unusable.

[0046] Furthermore, for example, the first nozzle 21, the first storage section 40, the second nozzle 23, and the second storage section 41 are formed such that the first volume E1 of the first explosive 60 in the first nozzle 21 is greater than the second volume E2 of the second explosive 62 in the second nozzle 23. As a result, even after the combustion of the second explosive 62 in the second nozzle 23 has finished, the combustion of the first explosive 60 in the first nozzle 21 continues, making it easier to set up a region within the relatively sealed space of the hard disk 50 where the main flow of flame and high-temperature combustion gas is induced from the first nozzle 21 to the second nozzle 23. Therefore, the main flow of flame and high-temperature combustion gas is easier to control within the hard disk 50, making it easier to efficiently render a wide area of ​​the platter 53 unusable.

[0047] Furthermore, as shown in Figure 4, for example, the length L1 from the inlet of the first explosive 60 placed in the first nozzle 21 and the first storage section 40 is longer than the length L2 from the inlet of the second explosive 62 placed in the second nozzle 23 and the second storage section 41. The length of the explosive's burning time corresponds to the length of its placement. Therefore, the burning time of the first explosive 60 becomes longer than the burning time of the second explosive 62. As a result, even after the burning of the second explosive 62 on the second nozzle 23 side has finished, the burning of the first explosive 60 on the first nozzle 21 side continues, making it easier to set up a region in the relatively enclosed space of the hard disk 50 where the main flow of flame and high-temperature combustion gas is induced from the first nozzle 21 to the second nozzle 23. Therefore, the main flow of flame and high-temperature combustion gas is easier to control within the hard disk 50, making it easier to efficiently render a wide area of ​​the platter 53 unusable.

[0048] In this configuration, the base body 12 with the hard disk 50 positioned inside, the first holder 14, the second holder 15, and the lid 16 are combined to form a rectangular shape with a depth L=14.6cm, a width W=10.2cm, and a height H=2.5cm, as shown in Figures 1, 3, and 4. Therefore, this combined form has the same external dimensions as a 3.5-inch standard hard disk drive. When viewed from above, the base body 12, the first holder 14, the second holder 15, and the lid 16 are formed to have a common rectangular external shape. Therefore, these four components are combined to form a single rectangular box component. Thus, the information leakage suppression device 1 can be easily placed inside the personal computer 2, and the information leakage suppression device 1 is formed in a simple shape that is easy for the user to handle.

[0049] The information leakage suppression device 1 further includes an ignition device 22 for igniting the first explosive 60 and / or the second explosive 62, a second power supply device 24, and an operating device 30.

[0050] The second power supply unit 24 supplies power to the ignition device 22 and the actuator 30 independently, separate from the first power supply unit 7 of the personal computer 2 which supplies power to the hard disk 50. The second power supply unit 24 is located inside the case 3. The second power supply unit 24 can be made up of, for example, dry cell batteries or a battery. Therefore, even if the power to the personal computer 2 is disconnected, the second power supply unit 24 can operate the ignition device 22 using a separate power supply. The second power supply unit 24 may be located in the space within the information leakage suppression device 1. The second power supply unit 24 is electrically connected to the ignition device 22 and the actuator 30, etc. The second power supply unit 24 may also be electrically connected to the first power supply unit 7 for charging functions, etc.

[0051] The actuator 30 includes, for example, a wire loop sensor. When the loop circuit of the wire 32 of the actuator 30 is cut or broken, the detection unit detects that the circuit has been cut and transmits an activation signal to the ignition device 22. As a result, for example, if someone tries to take away the personal computer 2 along with the case 3, the loop circuit of the actuator 30 will be cut and the ignition device 22 will activate immediately. Alternatively, for example, if someone tries to remove the information leakage suppression device 1 from the drive inside the case 3 without following the procedure and take it away, the loop circuit of the actuator 30 may be cut and the ignition device 22 may activate immediately. The actuator 30 is located inside the case 3, and the loop circuit of its wire 32 is configured to return to the inside of the case 3 via a component outside the case 3. Furthermore, the actuator 30 may be equipped with a wireless communication unit capable of wireless communication, and may determine the operation of the ignition device 22 by receiving a predetermined activation signal from an external source, and transmit the activation signal to the ignition device 22. This makes it possible for an administrator to activate the ignition device 22 from a remote location to prevent information leakage.

[0052] The ignition device 22 is configured to ignite the first explosive 60 and the second explosive 62, thereby initiating the combustion of the explosives. The ignition device 22 ignites the first explosive 60 in the first nozzle and the second explosive 62 in the second nozzle. The ignition device 22 is formed near the lower end of the first nozzle 21. Similarly, the ignition device 22 is also formed near the lower end of the second nozzle 22. The ignition device 22 includes a heating section 22a, for example, made of wound nichrome wire. The ignition device 22 is connected to a second power supply unit 24, which supplies power to the ignition device 22 independently. The ignition device 22 is connected to the second power supply unit 24 via a power line 22b. In Figure 4, the power line 22b is shown by a dashed line. The ignition device 22 is activated by a command from the actuator 30, and by energizing the heating section 22a, the nichrome wire is heated to a high temperature, for example, about 300 to 400 degrees Celsius, which ignites the first explosive 60 and / or the second explosive 62. The ignition device 22 can ignite the first explosive 60 in the first nozzle 21 and the second explosive 62 in the second nozzle 22 at almost the same time by a command from the actuator 30. As a variation, the ignition device 22 may use an ignition bulb, and by energizing the ignition bulb, the ignition bulb may be ignited, and the ignition bulb may ignite the first explosive 60 and / or the second explosive 62.

[0053] The actuator 30 has a function that can control the ignition of the ignition device 22, for example. When the ignition device 22 receives an activation command, it starts supplying power to the heating unit 22a for igniting the first explosive 60 and / or the second explosive 62. When the ignition device 22 determines that it has not received an activation command, it is controlled not to supply power to the heating unit 22a. The actuator 30 may be located, for example, within the case 3, at a distance from the first holder, etc. The ignition device 22 is electrically connected to the heating unit 22a and the second power supply unit 24. In addition, all or part of the ignition device 22 may be formed by a control unit such as the memory of the personal computer 2. The ignition device 22 incorporates a CPU 17 and a storage device 19 such as memory, and controls connected equipment to execute predetermined controls based on a predetermined control program recorded in the memory, etc. The ignition device 22 is electrically connected to the actuator 30, the second power supply unit 24, etc. These electrical connections may be made by wireless communication, etc. The ignition device 22 stores a program that allows it to execute an operating mode in which it starts supplying power to the heating unit 22a when it receives an operation command. The ignition device 22 also stores a program that allows it to execute a non-operating mode in which it does not start supplying power to the heating unit 22a when it does not receive an operation command.

[0054] Next, with reference to Figure 3, the manufacturing method and arrangement method of the information leakage suppression device 1 will be explained.

[0055] First, the base body 12, the first holder 14, the second holder 15, and the lid 16 of the information leakage suppression device 1 are prepared. 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 configured to be used in the same way as a normal hard disk 50.

[0056] The first holder 14 and the second holder 15 are separated and formed as separate components. Therefore, the first holder 14 equipped with a first nozzle 21 and a second nozzle 23 of a different diameter C2 can be replaced with the first holder 14 equipped with a first nozzle 21 and a second nozzle 23 of a predetermined diameter C1 (see Figure 4, etc.). By attaching the first holder 14 equipped with a first nozzle 21 and a second nozzle 23 of a different diameter C2 (see Figure 8, etc.), the penetration force into the hard disk 50 and the combustion state can be adjusted. For example, if the diameter C2 of the first nozzle 21 of the first holder 14 is made smaller than the predetermined diameter C1, the penetration force into the hard disk 50 can be increased. For example, in models where the metal constituting the hard disk case 56 is robust, forming the diameter of the first nozzle 21 slightly smaller makes it easier to form a hole in the top surface of the hard disk case 56. Conversely, if the diameter of the first nozzle 21 is made relatively large, the stability of combustion can be improved, and combustion burning inside the hard disk 50 can be carried out relatively stably. As another variation, the diameter of the second nozzle 23 may be made smaller than the diameter of the first nozzle 21, so that the opening of the hard disk case 56 on the second nozzle 23 side can be reliably formed in a short period of time. By making the first holder 14 replaceable, the design of the first nozzle 21 and / or the second nozzle 23 can be changed to enable combustion that matches the hard disk 50. By making the first holder 14 replaceable, the degree of design freedom of the first nozzle 21 and / or the second nozzle 23 can be increased.

[0057] As a further modification, the position of the first nozzle 21 and / or the second nozzle 23 can be changed by making the first holder 14 replaceable. Depending on the type and model of the hard disk 50 in question, there may be a need to adjust the position of the first nozzle 21 and / or the second nozzle 23. In such cases, the first holder 14 can be made replaceable without having to remake the entire information leakage suppression device 1.

[0058] The first explosive charge 60 is placed in the first nozzle 21 of the first holder 14 and the first storage section 40 of the second holder 15. The heating section 22a of the ignition device 22 is located at the lower end of the first nozzle 21. The ignition device 22 is connected from the heating section 22a via a power line 22b.

[0059] The second explosive charge 62 is placed in the second nozzle 23 of the first holder 14 and the second storage section 41 of the second holder 15. A spacer member 43 is placed in the second storage section 41 to fill a portion of the explosive charge storage area. The second explosive charge 62 may be placed without the spacer member 43. The heating section 22a of the ignition device 22 is placed at the lower end of the second nozzle 23. The ignition device 22 is connected from the heating section 22a via a power line 22b.

[0060] The information leakage suppression device 1 is assembled by combining the base body 12 on which the hard disk 50 is placed, the first holder 14 in which the first explosive 60 is loaded into the first nozzle 21 and the second explosive 62 is loaded into the second nozzle 23, the second holder 15 in which the first explosive 60 is loaded into the first storage section 40 and the second explosive 62 is loaded into a part of the second storage section 41, and the lid 16. Screws (not shown) are then inserted into screw holes (not shown) formed at all four corners of the lid 16, the first holder 14, the second holder 15, and the base body 12, and the lid 16, the first holder 14, the second holder 15, and the base body 12 are fixed in a tightly fastened state. The information leakage suppression device 1 is placed in the 3.5-inch drive bay 9.

[0061] The wires 32 of the actuator 30 are wired to the appropriate location, and the ignition device 22 is put into standby mode.

[0062] Next, with reference to Figures 3, 5, 7, and 10, the operation of the information leakage suppression device 1 in disabling the use of platters in the hard disk 50 will be explained.

[0063] First, as shown in Figure 10, at time T0, the ignition device 22 of the information leakage suppression device 1 begins heating the first explosive 60 in the first nozzle 21 and the second explosive 62 in the second nozzle 23, respectively. The timing of when the ignition device 22 begins heating the second explosive 62 is synchronized with the timing of when the ignition device 22 begins heating the first explosive 60. Therefore, the ignition device 22 heats the first explosive 60 in the first nozzle 21 and the second explosive 62 in the second nozzle 23 at approximately the same time, and combustion begins at time T1. As a result, the first explosive 60 in the first nozzle 21 and the second explosive 62 in the second nozzle 23 begin burning at approximately the same time T1. The second explosive 62 in the second nozzle 23 burns out completely at time T2, immediately after forming the second opening 56g, and combustion ends. At time T2, after the second explosive 62 has finished burning, the first explosive 60 continues to burn, making it easier to define a region within the relatively enclosed space of the hard disk 50 where the flame and the main flow of high-temperature combustion gases are guided from the first nozzle 21 to the second nozzle 23. Furthermore, compared to the case where the heating timing of the first explosive 60 and the second explosive 62 are separate, 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 can be synchronized with a relatively simple configuration.

[0064] When the lower part of the first explosive charge 60 in the first nozzle 21 begins to burn, the explosive combustion of the explosive heats the iron plate of the flat plate 56e (see Figure 5) on the top surface of the hard disk case 56 to a high temperature of, for example, about 2000 degrees, and the blast creates a first opening 56f. For example, the opening formed in the flat plate 56e is circular and the same size as the opening in the first nozzle 21. Similarly, below the second nozzle 23, a circular second opening 56g of the same size as the second nozzle 23 is formed in the flat plate 56e. As shown in Figure 8, the second explosive charge 62 in the second nozzle 23 burns out completely as soon as it forms the second opening 56g in the flat plate 56e, and combustion ends. Since the combustion of the second explosive charge 62 stops after forming the second opening 56g, the second opening 56g can thereafter function as an outlet for the gas inside the hard disk 50 to escape. For example, if a gas flow resulting from the combustion of explosives is blown into the hard disk 50 through the first opening 56f, the gas inside the hard disk 50 can be released through the second opening 56g. On the other hand, the first explosive 60 of the first nozzle 21 continues to burn even after the first opening 56f is formed in the flat plate 56e.

[0065] Figures 11 and 12 show a schematic top view of the inside of the hard disk 50, illustrating the positional relationship between the platter 53 of the hard disk 50 and the first nozzle 21 and second nozzle 23. The positions of the first nozzle 21 and second nozzle 23 are illustrated with dashed lines. As described below, the positions of the first nozzle 21 and second nozzle 23 can be changed to any position, and the number of first nozzles 21 and second nozzles 23 can also be changed. To clearly illustrate the relationship between the platter 53, the first nozzle 21 and the second nozzle 23, the diagrams of components other than the actuator 54 of the hard disk 50 are omitted. The arrangement of the first nozzle 21 and the second nozzle 23 sets a flame induction region 70 that extends from the first opening 56f formed by the first explosive 60 in the first nozzle 21 to the second opening 56g formed by the explosive in the second nozzle 23. The flame induction region 70 is a region set within the hard disk 50. The flame induction region 70 indicates the main path through which, for example, the flame and the main flow of high-temperature combustion gases pass. As shown by arrow F1, the flame induction region 70 forms a zone with a width similar to the diameter of the first opening 56f. The flame induction region 70 is set as the region through which the main flame and high-temperature combustion gases flow from the first opening 56f to the second opening 56g when the flame and the main flow of high-temperature combustion gases from the gunpowder injected from the first opening 56f flow as a zone with a width similar to the diameter of the first opening 56f to the second opening 56g and then flow out from the second opening 56g. The flame induction region 70 is illustrated by a dashed line in Figure 11, for example. Generally, it is difficult to control the position and direction of flames and high-temperature gas flows. However, by setting a flame induction region 70 extending from the first opening 56f to the second opening 56g, it becomes easier to set and plan areas within the platter 53's memory area that are likely to be rendered unusable by the flame and high-temperature combustion gas flow. Furthermore, by setting the flame induction region 70, it becomes easier to control areas within the platter 53's memory area that are rendered unusable by the flame and high-temperature combustion gas flow. Also, by setting the flame induction region 70 relatively wide or long on the platter 53, a wide area can be efficiently rendered unusable. The width of the flame induction region 70 is configured to be the same as or slightly larger than the diameter of the first opening. This allows the width of the flame induction region 70 to be designed and planned according to the diameter of the first opening 56f. Thus, areas on the platter 53 that are to be rendered unusable can be planned.

[0066] As shown in Figure 11, the flame induction region 70 includes a first flame induction region 71 that extends linearly over the platter 53 in the hard disk 50 from the first opening 56f to the second opening 56g. This makes it easier to set the position where the main flow of the flame and combustion gases extends. Furthermore, it allows the main flow of the flame and combustion gases to be set to extend linearly, making it easier for the main flow of the flame and combustion gases to flow smoothly. For example, if the bearing at the top of the spindle motor section 52 has a structure that does not easily obstruct the main flow of the flame and combustion gases, the flame and combustion gases can flow linearly over the top of the spindle motor section 52, and the first flame induction region 71 is formed in a linear shape.

[0067] As shown in Figure 12, as a modification, the flame induction region 70 may include a second flame induction region 72 that extends in an arc shape along the circumferential direction of the platter 53 from the first opening 56f to the second opening 56g. For example, if the bearing at the top of the spindle motor section 52 is structured in a way that easily obstructs the main flow of flame and combustion gases, the flame and combustion gases can flow in an arc shape, bypassing the upper part of the spindle motor section 52 as shown by arrow F2, thereby forming the second flame induction region 72. This allows the second flame induction region 72 to be formed in a curved arc shape, rendering a wide area of ​​the platter 53 unusable.

[0068] In this way, the flame and high-temperature combustion gas main stream extending from the first gunpowder 60 of the first nozzle 21 are guided along the flame induction region 70 as described above, and the heat can burn out the memory area of ​​the platter 53, rendering it unusable. The flame and high-temperature combustion gas main stream have a temperature of, for example, about 2000 degrees Celsius, and the area relatively close to the flame and high-temperature combustion gas main stream is likely to render the memory area of ​​the platter 53 unusable. Furthermore, even in areas relatively far from the flame and high-temperature combustion gas main stream, the likelihood of rendering the memory area of ​​the platter 53 unusable can be increased. For example, by running the flame and high-temperature combustion gas main stream over a relatively long distance near the surface of the platter 53, a relatively large area of ​​the platter 53 can be rendered unusable in a short time. Note that "unusable" means that the platter 53 is rendered unusable to the extent that it is impossible or requires considerable effort and time to repair it and retrieve the information stored in it.

[0069] The main stream of flame and high-temperature combustion gas is guided along the flame induction region 70, but some of the branched flame and high-temperature combustion gas flows below and behind the platter 53. Although the branched flame and high-temperature combustion gas have lower heating performance than the main stream, they have the ability to render the memory area of ​​the platter 53 unusable. Therefore, the branched flame and high-temperature combustion gas flow below and behind the platter 53, making it easier to render not only the upper platter but also the lower platter unusable from the parts that have been heated by the flame and high-temperature combustion gas. The flame and combustion gas stream blown in from the first opening 56f is extremely hot and is blown into the hard disk 50 all at once, so even the branched flame and high-temperature combustion gas can render the memory area of ​​the platter 53 unusable due to heat. Therefore, even parts that are not directly hit by the main stream can be easily rendered unusable by the branched stream.

[0070] The combustion of the first explosive 60 in the first nozzle 21 continues for a certain period of time from time T1 to time T3, and the flame and the main stream of high-temperature combustion gases also continue to flow for a certain period of time. When the combustion of the first explosive 60 ends at time T3, the information leakage suppression operation by the information leakage suppression device 1 ends.

[0071] As described above, the information leakage suppression device 1 is not limited to one in which a flame flows from the first opening 56f toward the second opening 56g. As a modification, the information leakage suppression device 1 may be configured such that a flame is blown into the hard disk 50 from the first opening 56f, and at approximately the same time, a flame is blown into the hard disk 50 from the second opening 56g. By blowing flames into the hard disk 50 from the first opening 56f and the second opening 56g, the inside of the hard disk 50 is heated strongly around each opening, making it easier to render a wide area on the platter 53 unusable.

[0072] An example of one embodiment of the present invention may be provided in the following embodiments.

[0073] (1) An information leakage suppression device for suppressing the leakage of information from a hard disk, comprising: a base body on which the hard disk is placed on the inner upper surface; a first holder placed in contact with the upper surface of the hard disk, comprising a first nozzle formed to penetrate from the bottom surface to the top surface inside the first holder and having explosives placed inside; and a second nozzle formed to penetrate from the bottom surface to the top surface inside the first holder and having the explosives placed inside; a second holder placed in contact with the upper surface of the first holder and configured as a separate member from the first holder, comprising a first storage portion connected to the first upper opening of the first nozzle and a second storage portion connected to the second upper opening of the second nozzle; a lid portion placed in contact with the upper surface of the second holder and formed in the shape of a flat plate; and an ignition device for igniting the explosives in the first nozzle and the explosives in the second nozzle, wherein the first holder is formed to be interchangeable with the first holder having the first nozzle and second nozzle of different shapes.

[0074] (2) The information leakage suppression device according to (1), wherein the first storage portion of the second holder is formed by a first opening extending laterally, and the second storage portion of the second holder is formed by a second opening extending laterally.

[0075] (3) The information leakage suppression device according to (1), wherein the first storage section is formed to extend in a straight line, and the second storage section is formed to extend in a straight line, and the first storage section and the second storage section are arranged in parallel.

[0076] (4) The information leakage suppression device according to (1), wherein the base body, the first holder, the second holder, and the lid are formed to have a common rectangular outer shape when viewed from above.

[0077] (5) The information leakage suppression device according to (1), wherein the first upper opening of the first nozzle is connected to one end of the first storage section, and the second upper opening of the second nozzle is connected to one end of the second storage section.

[0078] (6) The information leakage suppression device according to (1), wherein the second storage section is provided with a spacer member that fills a part of the explosive storage section and is formed so that the amount of explosive to be stored in the second storage section can be adjusted. [Explanation of Symbols]

[0079] 1: Information leakage control device 4: First storage compartment 12: Base body 14: First holder 14a: Bottom surface 14b:Top surface 15: Second holder 16: Lid 21: Nozzle No. 1 22: Second nozzle 22:Ignition device 23: Second nozzle 40: First storage compartment 41: Second storage compartment 43: Spacer member 50: Hard disk 50a:Top surface

Claims

1. A device for suppressing information leakage from hard disks, A base body having the aforementioned hard disk positioned on its inner upper surface, A first holder positioned in contact with the upper surface of the hard disk, comprising: a first nozzle formed to penetrate from the bottom surface to the top surface inside the first holder and having explosives placed inside; and a second nozzle formed to penetrate from the bottom surface to the top surface inside the first holder and having the explosives placed inside; A second holder is positioned to contact the upper surface of the first holder and is configured as a separate component from the first holder, comprising a first storage portion connected to the first upper opening of the first nozzle and a second storage portion connected to the second upper opening of the second nozzle, A lid portion is positioned so as to be in contact with the upper surface of the second holder and is formed in a flat plate shape, The device comprises an ignition device for igniting the gunpowder in the first nozzle and the gunpowder in the second nozzle, An information leakage suppression device wherein the first holder is formed to be interchangeable with the first holder having a first nozzle and a second nozzle of different shapes.

2. The first storage portion of the second holder is formed by a first opening that extends laterally, The information leakage suppression device according to claim 1, wherein the second storage portion of the second holder is formed by a second opening extending laterally.

3. The information leakage suppression device according to claim 1, wherein the first storage section is formed to extend in a straight line, the second storage section is formed to extend in a straight line, and the first storage section and the second storage section are arranged in parallel.

4. The information leakage suppression device according to claim 1, wherein the base body, the first holder, the second holder, and the lid are formed to have a common rectangular outer shape when viewed from above.

5. The information leakage suppression device according to claim 1, wherein the first upper opening of the first nozzle is connected to one end of the first storage section, and the second upper opening of the second nozzle is connected to one end of the second storage section.

6. The information leakage suppression device according to claim 1, wherein the second storage section is provided with a spacer member that fills a part of the second storage section and is formed so that the amount of explosives to be stored in the second storage section can be adjusted.

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