Information leakage suppression device

Abstract

The present invention provides an information leakage suppression device that can easily render information on a hard disk unusable and suppress the leakage of information from a hard disk. [Solution] The information leakage suppression device 1 comprises a base body 12, a holder 14 positioned in contact with the upper surface of the hard disk, the holder having a nozzle portion 21 that opens toward the upper surface of the hard disk, and a combustion chamber 40 connected to the nozzle portion and for burning explosives placed inside, and a lid portion 16. The nozzle portion forms an inner opening with a first area A1, and the combustion chamber forms a combustion surface with a second area A2. The first area A1 of the inner opening is smaller than the second area A2 of the combustion surface, so that the flow path of combustion gas from the combustion chamber 40 to the nozzle portion 21 is narrowed, the combustion gas flowing from the combustion chamber to the nozzle portion is accelerated, and the device is configured to make it easier to form a hole in the upper surface of the hard disk.

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 stored in hard disks. While countermeasures are taken against intrusion from the network into the hard disk, there are still issues regarding countermeasures against information leakage due to physical theft of the personal computer, such as the hard disk being physically stolen together with the personal computer or being forcibly taken away even if the theft is noticed.

[0003] For example, Patent Document 1 proposes a personal computer theft countermeasure system that locks the hard disk installed in the personal computer when the personal computer is stolen, by utilizing 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] Also, when it is necessary to quickly stop information leakage from the personal computer, 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 easily 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 holder placed in contact with the upper surface of the hard disk, the holder comprising: a nozzle portion opening toward the upper surface of the hard disk; and a combustion chamber connected to the nozzle portion and for burning explosives placed inside; and a lid portion placed in contact with the upper surface of the holder and formed in a flat plate shape, wherein the nozzle portion forms an inner opening of a first area, and the combustion chamber forms a combustion surface of a second area, and the first area of ​​the inner opening is smaller than the second area of ​​the combustion surface, so that the flow path of combustion gas from the combustion chamber to the nozzle portion is narrowed, the combustion gas flowing from the combustion chamber to the nozzle portion is accelerated, and the device is configured to make it easier to form a hole in the upper surface of the hard disk. According to the embodiment of the present invention configured in this manner, the nozzle portion forms an inner opening of a first area, and the combustion chamber forms a combustion surface of a second area, with the first area of ​​the inner opening being smaller than the second area of ​​the combustion surface. As a result, the flow path of combustion gas from the combustion chamber to the nozzle portion is narrowed, and the combustion gas flowing from the combustion chamber to the nozzle portion is accelerated. Therefore, it is possible to easily form a hole in the upper surface of the hard disk. Therefore, it is possible to easily render the information in the hard disk unusable, and the leakage of information from the hard disk can be suppressed. [Effects of the Invention]

[0010] According to the information leakage suppression device of the present invention, it is possible to make it easier to render information on a hard disk 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 2. [Figure 5] This is a cross-sectional view of an information leakage suppression device according to one embodiment of the present invention, taken along the line V-V in Figure 2. [Figure 6] Figure 4 is an enlarged cross-sectional view showing the vicinity of the hard disk. [Figure 7] This is a top view of the holder of an information leakage prevention device according to one embodiment of the present invention, as seen from above. [Figure 8] This is a block diagram showing the configuration of an information leakage prevention device according to one embodiment of the present invention. [Figure 9] This is a time chart showing the combustion timing of explosives in the combustion chamber of an information leakage suppression device according to one embodiment of the present invention. [Figure 10] This is a schematic diagram illustrating the relationship between the hard disk platter and the nozzle portion in an information leakage suppression device according to one embodiment of the present invention. [Figure 11] This is a cross-sectional view showing a modified example of the information leakage suppression device according to one embodiment of the present invention, as shown in Figure 4. [Modes for carrying out the invention]

[0012] Hereinafter, with reference to the accompanying drawings, an information leakage prevention device 1 according to an embodiment of the present invention will be described. Embodiments of the present disclosure are described by way of example, and it will be apparent to those skilled in the art that many modifications, changes, 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 modifications, changes, etc. are possible in its form and details without departing from the scope of the claims. Also, 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 suppressing the leakage of information from a hard disk. The information leakage prevention device 1 also functions as a device for destroying the hard disk so that the information in the hard disk 50 (see FIG. 6) becomes unusable. For example, when the hard disk is about to be forcefully taken away or has been taken away together with the personal computer, the information leakage prevention device 1 can make the information in the hard disk immediately unusable by igniting gunpowder within a short period of about several seconds to ten and several seconds, and can suppress the leakage of information from the hard disk. 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 the characteristic of being 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, with the right side being the right side and the left side being the left side when facing the front side of the information leakage prevention device 1, the upper side being the upper side of the information leakage prevention device 1, and the lower side being the lower side of the information leakage prevention device 1 for description.

[0014] As shown in Figure 1, the information leakage suppression device 1 is located 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 6), 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 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 the space of two 3.5-inch drive bays 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. Users can, for example, add hard disks or the like by fixing them into these 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 section for receiving the hard disk 50, a holder 14, and a lid 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 in top view, forming a rectangular shape 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 a concave portion 12a is formed in the central portion. The concave 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 concave portion 12a is formed such that a slightly gap space is formed outside with a so-called 2.5-inch standard hard disk drive arranged inside. The bottom surface of the concave portion 12a is flat and formed in a rectangular shape. For example, with a so-called 2.5-inch standard hard disk drive 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 at the same height. Therefore, the holder 14 and the base body 12 can be combined in a state where the 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, using a commercially available high-performance so-called 2.5-inch standard hard disk drive, the overall information leakage prevention device 1 has the same outer size as two slots of a so-called 3.5-inch standard hard disk drive (for example, the outer size of two so-called 3.5-inch standard hard disk drives stacked), and can be arranged in an area equivalent to two slots of a hard disk storage slot of a general personal computer. Note that since the lid portion 16 and the base body 12 are tightened with one screw and penetrate the holder 14, it is possible to configure the information leakage prevention device 1 even if the size of the hard disk drive received in the concave 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 the arrangement of the 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, holder 14, and lid 16 from exploding and damaging surrounding objects.

[0018] As shown in Figure 6, 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. Note that the internal structure of the hard disk 50 is not shown in Figures 4 and 5.

[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 holder 14 is positioned so as to be in contact with the top surface of the hard disk 50. When viewed from above, the 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 holder 14 are the same as those of a so-called 3.5-inch standard hard disk drive. The holder 14 forms a flat plate. The holder 14 is made of a stainless steel metal component.

[0026] The holder 14 comprises a nozzle portion 21 and a combustion chamber. The nozzle portion 21 opens toward the upper surface of the hard disk 50. As shown in Figure 44, the nozzle portion 21 extends upward from the upper surface of the hard disk 50. The nozzle portion 21 extends upward from the lower surface 14a inside the holder 14. The nozzle portion 21 forms a cylindrical passage. The nozzle portion 21 is formed on the metal plate of the holder 14. The diameter of the horizontal cross-section of the nozzle portion 21 is formed to be constant from the bottom to the top of the nozzle portion 21. The nozzle portion 21 may be formed such that the opening area widens from the top to the bottom. The nozzle portion 21 comprises an inner opening toward the combustion chamber 40 and an outer opening toward the hard disk 50. The outer opening of the nozzle portion 21 is formed on the lower surface of the holder 14. The inner opening of the nozzle portion 21 is formed on the bottom surface of the combustion chamber 40. The nozzle portion 21 is connected to the bottom surface of the combustion chamber 40. The nozzle portion 21 is positioned so as to overlap the lower side of the combustion chamber 40 when viewed from above. This allows the cross-section up to the inlet portion 40a of the combustion chamber 40 to be formed similarly, making it easier to achieve stable combustion. The nozzle portion 21 is not limited to a cylinder and may be formed in a square cross-section or other shapes. The diameter of the nozzle portion 21 is, for example, a value in the range of 4 mm to 15 mm, for example, a value in the range of 4 mm to 10 mm, or for example, a value in the range of 4 mm to 8 mm. The length in the longitudinal direction of the nozzle portion 21 is, for example, a value in the range of 2 mm to 10 mm, or for example, a value in the range of 2 mm to 5 mm. The length in the longitudinal direction of the nozzle portion 21 is shorter than the height of the combustion chamber 40. By forming the length of the nozzle portion 21 to be relatively short, it is possible to suppress the decrease in flow velocity due to flow resistance while maintaining the function of improving the flow velocity of the combustion gas. No explosives are placed inside the nozzle portion 21, but explosives may be placed inside. As a modified example, as shown in Figure 11, the nozzle portion 21 may be formed such that its opening area widens from top to bottom. By forming the nozzle portion 21 so that its opening area widens from top to bottom, resistance to the flow of combustion gases is reduced, and holes can be formed efficiently.

[0027] The nozzle portion 21 forms an inner opening 21a with a first area A1. The inner opening 21a is formed in a circular shape. The inner opening 21a of the nozzle portion 21 has a circular cross-section. Because the inner opening 21a has a circular cross-section, it is designed to allow combustion gas to flow in smoothly. The inner opening 21a may be formed in any shape. The diameter of the inner opening 21a is a diameter value in the range of 4 mm to 10 mm, for example, a diameter value in the range of 4 mm to 6 mm. The outer opening 21b is formed in the same shape as the inner opening 21a. For example, the outer opening 21b is formed in a circular shape. The outer opening may be formed in any shape. The diameter of the outer opening 21b is a diameter value in the range of 4 mm to 10 mm, for example, a diameter value in the range of 4 mm to 6 mm. The outer opening may be formed in a different shape from the inner opening. The first area A1 of the nozzle portion 21 can be, for example, the area of ​​a circle with a diameter of 4 mm to 6 mm. The first area A1 is, for example, approximately 12.56 mm². 2 It can be done.

[0028] Furthermore, for example, the central axis X1 of the nozzle section 21 is positioned perpendicular to the top surface of the hard disk 50. In a top view, the central axis X1 of the nozzle section 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 nozzle section 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 6), thereby efficiently rendering the stored data on the platter unusable. The central axis X1 of the nozzle section 21 is positioned offset from the spindle motor section 52 of the platter of the hard disk 50 when viewed from above. As a result, the combustion of the gunpowder 60 in the combustion chamber 40 causes the flame to enter the hard disk 50 from the nozzle section 21 at a position offset from the spindle motor section 52 of the platter. This makes it easier for the flame and the main stream of high-temperature combustion gases associated with the flame to spread concentrically around the lower front portion of the nozzle section 21 and the platter in the lower front portion, efficiently rendering the stored data on the platter unusable. The combustion chamber 40 is configured to hold gunpowder 60 inside. The gunpowder 60 can be made from common gunpowder, such as black powder, smokeless powder, or solid propellant. For example, the gunpowder 60 may be made from a mixture of a flammable rubber base material with an oxidizer or metal particles.

[0029] As shown in Figure 4, the length of the explosive arrangement is the length of the explosive 60 arranged from the inlet 40a of the combustion chamber 40 to the end 40b opposite the nozzle 21. The explosive 60 is arranged over almost the entire length from the inlet 40a to the end 40b. The combustion chamber 40 is formed to accommodate an explosive 60 of a first capacity E1. The first capacity E1 is, for example, the volume from the inlet 40a of the combustion chamber 40 to the end 40b opposite the nozzle 21.

[0030] The flame and combustion gas ejected from the nozzle 21 can form a hole in the upper surface of the hard disk case 56, as shown by arrow D1 (see Figure 4). The 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 platters 53 unusable. The nozzle 21 is located above the end 53d of the platter opposite to the actuator side. The nozzle 21 can be positioned at any desired location.

[0031] The combustion chamber 40 is connected to the nozzle section 21. The combustion chamber 40 is connected to the upper end of the nozzle section 21. The combustion chamber 40 is formed to the vertically above the nozzle section 21. As shown in Figure 7, the nozzle section 21 is positioned so as to overlap the lower side of the combustion chamber 40 when viewed from above. The combustion chamber 40 extends laterally from above the nozzle section 21. This allows the combustion chamber 40 to be made relatively long, and also makes it possible to set a relatively long burning time for the gunpowder. The combustion chamber 40 extends in a direction perpendicular to the nozzle section 21. This makes it easier to suppress the height of the holder 14. In addition, the thickness of the metal plate between the combustion chamber 40 and the lower surface 14a of the holder 14 can be formed relatively uniformly, and the strength of the holder 14 during combustion can be made relatively strong. When viewed from the top surface of the holder 14, the combustion chamber 40 forms a groove. The combustion chamber 40 forms a linear storage section. The combustion chamber 40 is formed to extend linearly in the horizontal direction. The bottom surface of the opening of the combustion chamber 40 is formed by a plane extending in the horizontal direction. The upper end of the opening of the combustion chamber 40 is formed on the upper surface of the holder 14. The combustion chamber 40 extends along the longitudinal direction of the holder 14. In a top view, the combustion chamber 40 forms a substantially rectangular groove. In a longitudinal cross-section, the combustion chamber 40 is formed in a square shape, for example. The combustion surface B of the combustion chamber 40 forms a square cross-section. Because it has a square cross-section in this way, end-face combustion can be formed to proceed towards the back while maintaining a relatively stable and constant combustion surface B. For example, in end-face combustion, combustion proceeds at a relatively constant speed. One end of the combustion chamber 40 has an arc-shaped end that matches the upper opening of the nozzle portion 21 in a top view. The inlet portion 40a of the combustion chamber 40 is formed in a substantially semicircular shape, and in a top view, the inner opening 21a is located within the semicircular shape. The combustion gas generated by the combustion of gunpowder in the combustion chamber 40 flows smoothly into the nozzle section 21 along an arc. This makes it less likely for the combustion gas to choke at the inner opening 21a of the nozzle section 21. The other end of the combustion chamber 40 also has an arc-shaped end when viewed from above. The longitudinal length K of the combustion chamber 40 is, for example, a value within the range of 20 mm to 50 mm. The transverse length (width) M of the combustion chamber 40 is a value within the range of 5 mm to 20 mm.The longitudinal length K of the combustion chamber 40 is within the range of 5 to 20 times the longitudinal length of the nozzle section. The longitudinal length of the combustion chamber 40 can be set to be relatively longer than the length of the nozzle section 21, allowing for an increase in the amount of gunpowder 60 to be filled and thus a longer burning time. Also, the nozzle section 21 can be made relatively short, thereby reducing the flow resistance of the nozzle section 21. The height N of the combustion chamber 40 is within the range of 5 mm to 20 mm. The upper opening of the nozzle section 21 is connected to one end of the inlet section 40a of the combustion chamber 40. The nozzle section 21 is positioned so as to be approximately within the semicircular region protruding from the inlet section 40a of the combustion chamber 40 when viewed from above.

[0032] The combustion chamber 40 burns the gunpowder placed inside. The combustion chamber 40 is generally filled with gunpowder. For example, the combustion chamber 40 is filled with gunpowder from the inlet to the end opposite the nozzle 21. The gunpowder 60 inside the combustion chamber 40 is formed to enable end-face combustion. For example, the combustion area of ​​the gunpowder 60 inside the combustion chamber 40 is equal to the cross-sectional area of ​​the vertical section of the combustion chamber 40. The combustion chamber 40 forms a second combustion surface B. The combustion surface B of the combustion chamber 40 has a square cross-section. By forming a square end combustion surface, end-face combustion can be made more stable, and a more stable combustion surface B can be formed. For example, the combustion surface B is formed in the vertical section of the combustion chamber 40. In Figure 4, a hypothetical combustion surface B is illustrated by a dashed line B. The area of ​​the combustion surface B corresponds to the combustion area of ​​the gunpowder 60 inside the combustion chamber 40. The first area A1 of the inner opening is smaller than the second area A2 of the combustion surface B, thereby narrowing the combustion gas flow path from the combustion chamber 40 to the nozzle section 21. This accelerates the combustion gas flowing from the combustion chamber 40 to the nozzle section 21, making it easier to form a hole on the upper surface of the hard disk 50. The second area A2 of the combustion surface B can be the area of ​​the rectangular cross-section of the combustion chamber 40, for example, the area of ​​a square with a width of 10 mm and a height of 10 mm. The second area A2 is, for example, approximately 100 mm². 2This can be achieved. As the combustion of the gunpowder 60 progresses, the combustion surface B moves away from the inlet of the combustion chamber 40. Although the combustion surface B moves, the second area A2 of the combustion surface B remains almost constant. The combustion surface B is formed in a direction perpendicular to the inner and outer openings of the nozzle portion 21. The direction of combustion of the gunpowder 60 in the combustion chamber 40, for example, the direction of movement of the combustion surface B, is different from the direction in which the nozzle portion 21 extends.

[0033] The second area A2 of the combustion surface B is within the range of 2 to 4 times the first area A1 of the inner opening of the nozzle section 21. This makes the first area A1 of the inner opening of the nozzle section 21 smaller by a predetermined ratio compared to the second area A2 of the combustion surface B of the explosive burning in the combustion chamber 40, increasing the velocity and temperature of the generated combustion gas. As a result, the velocity and temperature of the combustion gas and flame blown from the nozzle section 21 toward the hard disk 50 increase, making it easier to form a hole on the top surface of the hard disk 50. Furthermore, even when forming a hole, it can be formed more efficiently and in a shorter time. For example, increasing the combustion area increases the amount of gas generated, making it easier to increase the pressure and velocity of the combustion gas. However, if the first area A1 of the nozzle section 21 is made too small compared to the second area A2 of the combustion surface B, the combustion gas may not be able to be ejected from the nozzle section 21, resulting in a choked state and the risk of the combustion chamber 40 exploding. Therefore, with a predetermined safety margin, the second area A2 is limited to about 4 times the first area A1.

[0034] The second area A2 of the combustion surface B is three times the area A1 of the first area A1 of the inner opening 21a of the nozzle section 21. As a result, the first area A1 of the inner opening of the nozzle section 21 is reduced by a predetermined ratio to the second area A2 of the combustion surface B of the gunpowder in the combustion chamber 40, and the velocity and temperature of the generated combustion gas are increased. For example, by making the second area A2 three times the area of ​​the first area A1, it is possible to maintain a good balance between the amount of gas generated on the combustion surface B and the increase in the velocity and temperature of the generated combustion gas, and the possibility of combustion gas choking in the nozzle section 21 is also reduced.

[0035] The lid 16 is positioned so as to be in contact with the upper surface of the holder 14. The lid 16 is formed in a flat plate shape. The lid 16 is formed to cover the combustion chamber 40 of the holder 14 and also forms the ceiling surface of the combustion chamber 40. When viewed from above, the lid 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 16 are the same as those of a so-called 3.5-inch standard hard disk drive. The lid 16 is formed in a flat plate shape. The lid 16 is made of stainless steel metal. Screw holes are formed near the four corners of the lid 16, and screws are inserted into each of them, passing through the holder 14 and fastening to the base body 12, firmly fastening the lid 16, holder 14, and base body 12 together. The thickness (height H) of the structure assembled from these parts is 5 cm. For example, if the goal is to completely disable the hard disk 50 by filling it with a sufficient amount of explosive 60, the thickness of the information leakage suppression device 1 is 5 cm, which is the thickness of two so-called 3.5-inch standard hard disk drives.

[0036] In this configuration, the base body 12 with the hard disk 50 positioned inside, the holder 14, and the lid 16 are combined to form a rectangular shape with a depth LA = 14.6 cm, a width WA = 10.2 cm, and a height HA = 5 cm, as shown in Figures 1, 3, and 4. Therefore, the length and width of this combined form are the same as those of a standard 3.5-inch hard disk drive, and the height is about twice the height of a standard 3.5-inch hard disk drive. When viewed from above, the base body 12, the holder 14, and the lid 16 are formed to have a common rectangular outer 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.

[0037] The information leakage suppression device 1 further includes an ignition device 22 for igniting the explosive 60, a second power supply device 24, and an operating device 30.

[0038] 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.

[0039] 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.

[0040] The ignition device 22 is configured to ignite the gunpowder 60 in the combustion chamber 40 and initiate combustion of the gunpowder. The ignition device 22 is formed near the inlet of the combustion chamber 40. 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 that 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 1, the power line 22b is shown by a dashed line. The ignition device 22 is operated by a command from the actuator 30, and the nichrome wire is heated by energizing the heating section 22a, reaching a high temperature, for example, about 300 to 400 degrees Celsius, which ignites the gunpowder 60. The ignition device 22 can ignite the gunpowder 60 in the combustion chamber 40 by a command from the actuator 30. As a variation, the ignition device 22 may use an ignition bulb, which is ignited by applying current to it, and the gunpowder 60 is ignited by the ignition bulb.

[0041] 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 operation command, it starts supplying power to the heating unit 22a for igniting the gunpowder 60. When the ignition device 22 determines that it has not received an operation 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.

[0042] Next, with reference to Figure 3, the manufacturing method and arrangement method of the information leakage suppression device 1 will be explained.

[0043] First, the base body 12, holder 14, and 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.

[0044] The combustion chamber 40 of the holder 14 contains gunpowder 60. The heating element 22a of the ignition device 22 is located at the inlet of the combustion chamber 40. The ignition device 22 is connected to the heating element 22a via a power line 22b.

[0045] The information leakage suppression device 1 is arranged in an area equivalent to two levels of a 3.5-inch drive bay 9.

[0046] The wires 32 of the actuator 30 are wired to the appropriate location, and the ignition device 22 is put into standby mode.

[0047] Next, with reference to Figures 3, 5, 7, and 9, the operation of the information leakage suppression device 1 in disabling the platters in the hard disk 50 will be explained.

[0048] First, as shown in Figure 9, at time T0, the ignition device 22 of the information leakage suppression device 1 starts heating the gunpowder 60 in the combustion chamber 40. The gunpowder 60 in the combustion chamber 40 starts burning from time T1.

[0049] When the gunpowder 60 in the combustion chamber 40 begins to burn, the gunpowder 60 begins end-face combustion within the combustion chamber 40, and flames and combustion gases are blown out through the nozzle section 21. The combustion gases are rapidly narrowed and accelerated at the nozzle section 21. The combustion gases are ejected from the nozzle section 21 at a relatively high speed and temperature toward the hard disk case 56, and the iron plate of the flat plate 56e (see Figure 5) on the upper surface of the hard disk case 56 is heated to a high temperature of, for example, about 2000 degrees, and a first opening 56f is formed by the blast of the combustion gases. For example, the opening formed in the flat plate 56e is a circular opening and is the same size as the nozzle section 21. The gunpowder 60 in the combustion chamber 40 continues to burn even after the first opening 56f is formed in the flat plate 56e.

[0050] Figure 10 schematically illustrates the internal structure of the hard disk 50 in a top view, showing the positional relationship between the platter 53 and the nozzle section 21 of the hard disk 50. The position of the nozzle section 21 is illustrated by a dashed line. Note that the position of the nozzle section 21 can be changed to any position, and the number of nozzle sections 21 can also be changed. To clearly show the relationship between the platter 53 and the nozzle section 21, the diagram of components other than the actuator 54 of the hard disk 50 has been omitted. A flame induction region 70 extends into the hard disk from a first opening 56f formed by combustion gas from the nozzle section 21. The flame induction region 70 is formed to spread concentrically from the first opening 56f, as shown by arrow F1. The flame induction region 70 is a region set within the hard disk 50. The flame induction region 70 indicates, for example, the main path through which the flame and the main flow of high-temperature combustion gas pass. The flame induction region 70 is formed so that the flame of the gunpowder and the main stream of the high-temperature combustion gas flow blown in from the first opening 56f spread out from the first opening 56f. The flame induction region 70 is illustrated, for example, by a dashed line in Figure 10. The course of the flame induction region 70 can be changed under various conditions.

[0051] The first area A1 of the inner opening of the nozzle section 21 is smaller than the second area A2 of the combustion surface B of the combustion chamber 40. This creates a narrowed combustion gas flow path from the combustion chamber 40 to the nozzle section, accelerating the combustion gas flowing from the combustion chamber 40 to the nozzle section. The accelerated combustion gas makes it easier to widen the area of ​​the platter 53's memory region that is easily rendered unusable by the flame and the main flow of high-temperature combustion gas. By setting the flame induction region 70 relatively wide or long on the platter 53, a wide area can be efficiently rendered unusable. The flame induction region 70 is configured such that its width is 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, the area on the platter 53 that is rendered unusable can be planned.

[0052] In this way, the flame and the main stream of high-temperature combustion gas extending from the gunpowder 60 in the nozzle section 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 the main stream of high-temperature combustion gas have a temperature of, for example, about 2000 degrees Celsius, and in areas relatively close to the flame and the main stream of high-temperature combustion gas, the likelihood of rendering the memory area of ​​the platter 53 unusable can be increased. Furthermore, even in areas relatively far from the flame and the main stream of high-temperature combustion gas, the likelihood of rendering the memory area of ​​the platter 53 unusable can be increased. For example, by running the flame and the main stream of high-temperature combustion gas 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 so that the information stored in it can be retrieved.

[0053] 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.

[0054] The combustion of the gunpowder 60 in the combustion chamber 40 continues for a certain period of time from time T1 to time T2, 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 gunpowder 60 ends at time T2, the information leakage suppression operation by the information leakage suppression device 1 ends.

[0055] As described above, the information leakage suppression device 1 is not limited to the case in which flames are blown into the hard disk 50 only from the first opening 56f. As a modification, an information leakage suppression device 1 may be formed in which flames are blown in from other openings in addition to the first opening 56f. By blowing flames in from other openings in addition to the first opening 56f, 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.

[0056] An example of one embodiment of the present invention may be provided in the following embodiments.

[0057] (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 holder placed in contact with the upper surface of the hard disk, the holder comprising: a nozzle portion opening toward the upper surface of the hard disk; and a combustion chamber connected to the nozzle portion and for burning explosives placed inside; and a lid portion placed in contact with the upper surface of the holder and formed in the shape of a flat plate, wherein the nozzle portion forms an inner opening of a first area, and the combustion chamber forms a combustion surface of a second area, and the first area of ​​the inner opening is smaller than the second area of ​​the combustion surface, so that the flow path of combustion gas from the combustion chamber to the nozzle portion is narrowed, the combustion gas flowing from the combustion chamber to the nozzle portion is accelerated, and the information leakage suppression device is configured to facilitate the formation of a hole in the upper surface of the hard disk.

[0058] (2) The information leakage suppression device according to (1), wherein the nozzle portion extends upward from the top surface of the hard disk, and the combustion chamber extends laterally with respect to the nozzle portion.

[0059] (3) The information leakage suppression device according to (1), wherein the nozzle portion extends upward from the top surface of the hard disk, and the combustion chamber extends in a direction perpendicular to the nozzle portion.

[0060] (4) The information leakage suppression device according to (1), wherein the second area of ​​the combustion surface is an area within the range of 2 to 4 times the first area of ​​the inner opening.

[0061] (5) The information leakage suppression device according to (1), wherein the second area of ​​the combustion surface is three times the area of ​​the first area of ​​the inner opening.

[0062] (6) The information leakage suppression device according to (1), wherein the inner opening of the nozzle portion has a circular cross-section, and the combustion surface of the combustion chamber has a square cross-section.

[0063] (7) The information leakage suppression device according to (1), wherein the combustion surface of the combustion chamber has a square cross-section.

[0064] (8) The information leakage suppression device according to (1), wherein the length of the combustion chamber in the longitudinal direction is within the range of 5 to 20 times the length of the nozzle portion in the longitudinal direction.

[0065] (9) The information leakage suppression device according to (1), wherein the longitudinal length of the nozzle portion is shorter than the height of the combustion chamber.

[0066] (10) The nozzle portion is connected to the bottom surface of the combustion chamber, and is the information leakage suppression device described in (1).

[0067] (11) The information leakage suppression device according to (1), wherein the nozzle portion is arranged to overlap the lower side of the combustion chamber when viewed from above.

[0068] (12) The information leakage suppression device according to (1), wherein the nozzle portion is formed such that the opening area widens from the top to the bottom.

[0069] The embodiments for carrying out the present invention are not limited to those described above, and further variations can be applied. Various alternative embodiments and examples will be apparent to those skilled in the art based on the disclosed technology.

[0070] Furthermore, in this embodiment, for example, the holder 14 has one nozzle section 21 and one combustion chamber 40, but as a modification, the holder 14 may have multiple nozzle sections 21 and combustion chambers 40. For example, the holder 14 may have a first nozzle section and a first combustion chamber connected thereto, as well as a second nozzle section and a second combustion chamber connected thereto. When the holder 14 has multiple nozzle sections in this way, multiple openings are formed on the top surface of the hard disk, and the flame induction region 70 may form a flame induction region that extends linearly on the platter 53 inside the hard disk 50 from a first opening 56f to another second opening. This makes it easier to set the position where the main stream of the flame and combustion gas flow extends. Also, the main stream of the flame and combustion gas flow can be set to extend between two openings, making it easier to smoothly guide the main stream of the flame and combustion gas flow. [Explanation of Symbols]

[0071] 1: Information leakage control device 12: Base body 14: Holder 16: Lid 21: Nozzle part 21a:Inner opening 40: Combustion chamber 50: Hard disk 50a:Top surface 60: Gunpowder

Claims

1. A device for suppressing information leakage from hard disks, A base body on which the aforementioned hard disk is positioned on the inner upper surface, A holder positioned so as to be in contact with the upper surface of the hard disk, comprising a nozzle portion that opens toward the upper surface of the hard disk, The holder comprises a combustion chamber connected to the nozzle portion and for burning gunpowder placed inside, The holder comprises a lid portion which is positioned to contact the upper surface of the holder and is formed in a flat plate shape, The nozzle portion forms an inner opening of a first area. The combustion chamber is configured to form a combustion surface of a second area, and the first area of ​​the inner opening is smaller than the second area of ​​the combustion surface, thereby narrowing the flow path of combustion gas from the combustion chamber to the nozzle, accelerating the combustion gas flowing from the combustion chamber to the nozzle, and making it easier to form a hole on the upper surface of the hard disk, in this information leakage suppression device.

2. The information leakage suppression device according to claim 1, wherein the nozzle portion extends upward from the top surface of the hard disk, and the combustion chamber extends laterally with respect to the nozzle portion.

3. The information leakage suppression device according to claim 1, wherein the nozzle portion extends upward from the top surface of the hard disk, and the combustion chamber extends in a direction perpendicular to the nozzle portion.

4. The information leakage suppression device according to claim 1, wherein the second area of ​​the combustion surface is an area within the range of two to four times the first area of ​​the inner opening.

5. The information leakage suppression device according to claim 1, wherein the second area of ​​the combustion surface is three times the area of ​​the first area of ​​the inner opening.

6. The information leakage suppression device according to claim 1, wherein the inner opening of the nozzle portion has a circular cross-section, and the combustion surface of the combustion chamber has a square cross-section.

7. The information leakage suppression device according to claim 1, wherein the combustion surface of the combustion chamber has a square cross-section.

8. The information leakage suppression device according to claim 1, wherein the longitudinal length of the combustion chamber is within the range of 5 to 20 times the longitudinal length of the nozzle portion.

9. The information leakage suppression device according to claim 1, wherein the longitudinal length of the nozzle portion is shorter than the height of the combustion chamber.

10. The information leakage suppression device according to claim 1, wherein the nozzle portion is connected to the bottom surface of the combustion chamber.

11. The information leakage suppression device according to claim 1, wherein the nozzle portion is arranged to overlap the lower side of the combustion chamber when viewed from above.

12. The information leakage suppression device according to claim 1, wherein the nozzle portion is formed such that the opening area widens from the top to the bottom.

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