Information leakage suppression device

Abstract

To provide an information leakage prevention device that can suppress the leakage of information from hard disks. [Solution] The information leakage suppression device 1 comprises a base body 51 that forms the base of the hard disk, a first plate 14 that forms the top plate of the hard disk, a combustion section 16 that is placed on the first plate, an ignition device 17 that starts combustion in the combustion section, a second plate 15 that is placed above the combustion section, a storage section 18 that is formed on the second plate and contains the introduced substance, and a third plate 19 that forms the lid of the storage section. The first plate 14 is made of a first low-melting-point metal having a melting point lower than the assumed combustion temperature of the combustion section, and the second plate 15 is made of a second low-melting-point metal having a melting point lower than the assumed combustion temperature of the combustion section.

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 a network into a hard disk, there are problems regarding countermeasures against information leakage due to physical theft of a personal computer, such as the hard disk being 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 a hard disk installed in a 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 a personal computer unavoidably, conventionally, means of physically destroying it with a hammer or an ax have been used. However, since a 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 cause malfunctions in the platters and magnetic heads inside a hard disk, thereby suppressing information leakage from the 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 forming the base of the hard disk; a first plate forming the top plate of the hard disk; a combustion section disposed on the first plate; an ignition device for starting combustion of the combustion section; a second plate disposed above the combustion section; a storage section formed on the second plate for accommodating an introduced substance; and a third plate forming the lid of the storage section, wherein the first plate is made of a first low-melting-point metal having a melting point lower than the assumed combustion temperature of the combustion section, and the second plate is made of a second low-melting-point metal having a melting point lower than the assumed combustion temperature of the combustion section. According to the embodiment of the present invention configured in this manner, the combustion of the combustion section placed between the first plate and the second plate causes the first low-melting-point metal of the first plate to melt and form holes, and the second low-melting-point metal of the second plate to melt and form holes. As a result, the material introduced into the housing section is introduced into the hard disk through the holes. Therefore, it is possible to easily cause malfunctions in the platters and magnetic heads inside the hard disk, thereby suppressing information leakage from the hard disk. [Effects of the Invention]

[0010] According to the information leakage suppression device of the present invention, it is possible to suppress the leakage of information from a 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 1. [Figure 5] This is a cross-sectional view along the line V-V in Figure 1 of an information leakage suppression device according to one embodiment of the present invention. [Figure 6] This figure shows the combustion process in an information leakage suppression device according to one embodiment of the present invention, as viewed along the line IV-IV in Figure 1, where the combustion section is burned to form holes in the first plate and the second plate. [Figure 7] This is a block diagram showing the configuration of an information leakage prevention 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 Figure 1, an information leakage suppression device 1 according to one embodiment of the present invention can provide a device to suppress information leakage from a hard disk. The information leakage suppression device 1 also functions as a device that makes it difficult to read information from the platters of the hard disk so that the information in the hard disk 50 (see Figure 6) becomes unusable. For example, if the hard disk is about to be forcibly taken away along with the computer, or if it has been taken away, the information leakage suppression device 1 can create a path for introducing material from the housing to the hard disk by igniting explosives in a short period of a few seconds, making it difficult to read the information in the hard disk and thus suppressing information leakage from the hard disk. The hard disk 50 generally has the characteristic of being relatively hard and difficult to break even if one tries to destroy it physically, such as having the lower part of the hard disk case formed of die-cast aluminum. In the following description of one embodiment of the present invention, as shown in Figure 2, one longitudinal side of the information leakage suppression device 1 is referred to as the front, and the opposite side as the rear. When the information leakage suppression device 1 is facing forward, the right side is referred to as the right side, the left side as the left side, the upper side of the information leakage suppression device 1 is referred to as the upper side, and the lower side is referred to as the lower side.

[0014] As shown in FIG. 1, the information leakage prevention device 1 is disposed within the case 3 of the personal computer 2, which is a desktop personal computer, for example, placed on an office desk. The case 3 is formed in a box shape. In FIG. 1, the side panel of the case 3 is removed to show the internal structure. The personal computer 2 includes a so-called motherboard 6 on which a CPU, a memory, etc. are arranged, a first power supply device 7 that supplies power to the motherboard 6 and the hard disk 50 (see FIG. 3), the hard disk 50, and the information leakage prevention device 1. The information leakage prevention device 1 has a built-in hard disk 50 and is formed to be the same size as a so-called 3.5-inch standard hard disk device as a whole, as will be described later. Therefore, the information leakage prevention device 1 can be relatively easily housed in the 3.5-inch drive bay 9 within the case 3 of a commercially available personal computer 2. As shown in FIG. 1, a plurality of 3.5-inch drive bays 9 are formed within the case 3. For example, the user can fix and add a hard disk or the like to such a 3.5-inch drive bay 9. Further, a cooling fan 11 etc. are also provided within the case 3. The description of the internal structure of a general personal computer 2 will be omitted.

[0015] As shown in FIGS. 2 and 3, the information leakage prevention device 1 includes a hard disk 50, a first plate 14, a combustion part 16, an ignition device 17, a second plate 15, a housing part 18, and a third plate 19.

[0016] As shown in FIGS. 3 and 6 etc., the hard disk 50 will be described below. The hard disk 50 is, for example, a so-called 3.5-inch standard hard disk 50 device. The hard disk 50 includes a base body 51 formed by die-casting of metal, for example, aluminum etc., a spindle motor part 52 disposed on the base body 51, a platter 53, an actuator 54, and a magnetic head 55.

[0017] As shown in Figure 3, the base body 51 of the hard disk 50 forms the base of the hard disk. When viewed from above, the base body 51 of the hard disk 50 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 base body 51 are the same as those of a so-called 3.5-inch standard hard disk drive. The base body 51 is formed so that the outer periphery rises up from the flat base portion, and the central portion forms a recessed portion 51a. The recessed portion 51a forms a receiving portion for receiving the hard disk 50. The hard disk 50 is, for example, a so-called 3.5-inch standard hard disk drive. The bottom surface of the recessed portion 51a is flat and formed in a rectangular shape. A commercially available high-performance so-called 3.5-inch standard hard disk drive is used. The information leakage suppression device 1 is formed to have the same external dimensions as a so-called 3.5-inch standard hard disk drive in the front-to-back and left-to-right directions. The information leakage suppression device 1 is formed with an external size that, in the vertical direction, has a height equivalent to two so-called 3.5-inch hard disk drives. This allows it to be installed relatively easily, for example, by using two slots in the hard disk storage slots of a typical personal computer. Furthermore, the size and shape of the information leakage prevention device 1 are not limited to the same external dimensions as a 3.5-inch hard disk drive, but may be formed to any size and dimensions. For example, in the front-to-back and left-to-right directions, it may be formed to the same external dimensions as a 2.5-inch hard disk drive. If the overall size of the information leakage prevention device 1 changes, its convenience for PC placement will decrease, but the information leakage prevention device 1 will continue to provide a certain level of effectiveness.

[0018] The base body 51 is provided at the base of the hard disk 50. On the upper surface side of the base body 51, a spindle motor unit 52, an actuator 54, etc. are attached. The base body 51 is formed in a square shape when viewed from above. The base body 51 constitutes the lower part of the hard disk case and forms the hard disk case on its outer periphery. The base body 51 forms, for example, the standing wall 56 and the bottom surface portion of the hard disk case. The base body 51 is formed of a metal member such that its lower part is formed by die-casting of aluminum.

[0019] As shown in FIGS. 4 and 6, the spindle motor unit 52 is formed so as to rise vertically from the base body 51. The spindle motor unit 52 is formed in a columnar shape. The spindle motor unit 52 incorporates a spindle motor and is configured to be able to rotate the platter 53 around the spindle motor unit 52 in response to the rotation of the spindle motor. The inner peripheral portion of the platter 53 is connected to the outer peripheral portion of the spindle motor unit 52. For example, four platters 53 are connected to the spindle motor unit 52 in a vertically arranged state. The spindle motor unit 52 is configured to be able to rotate at a predetermined rotational speed.

[0020] 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 with a predetermined diameter when viewed from above. The platter 53 forms a storage area on its upper surface and is configured to be able to store a large amount of data. The platter 53 has a layer of a magnetic material for recording on its upper surface. The platter 53 is connected to the spindle motor unit 52 at its central portion. Thereby, the platter 53 is configured to rotate along with the rotation of the spindle motor unit 52. The magnetic head 55 can move on the platter 53 so that the magnetic head 55 can read the information stored on the platter 53. The platter 53 is formed of, for example, four platters 53, and the four platters 53 are arranged side by side in the vertical direction. The storage layer and the magnetic material layer of the platter 53 constitute a delicate storage area and are easily damaged to the extent of being unusable by even a little heat or dirt such as dust.

[0021] The actuator 54 is located on the outside of one side of the platter 53. The actuator 54 is located on the base body 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 base body 51.

[0022] The magnetic head 55 is located inside the vertical wall 56 of the base body 51 that constitutes the hard disk case. 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 the function of reading data from the platter 53.

[0023] The base body 51 constitutes the outer case of the hard disk 50. The vertical walls 56 of the base body 51 include 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 short direction from one end of the first wall 56a, and a fourth wall 56d extending parallel to the third wall 56c. The base body 51 is formed in the shape of a rectangular box with an open top. The third wall 56c is a wall provided on the magnetic head 55 and actuator 54 side. The fourth wall 56d is a wall provided on the platter 53 side. The first plate 14 is attached to the top surface of the base body 51.

[0024] The first plate 14 forms the top plate of the hard disk 50. The first plate 14 is provided to cover the rectangular opening formed by the first wall 56a, second wall 56b, third wall 56c, and fourth wall 56d of the vertical wall 56 of the base body 51. The first plate 14 is attached to the base body 51 and forms the rectangular parallelepiped shape of the hard disk 50. When viewed from above, the first plate 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 plate 14 are the same as those of a so-called 3.5-inch standard hard disk drive. The first plate 14 forms a flat plate. The thickness of the first plate 14 is in the range of 1 mm to 10 mm. The first plate 14 is made of a first low-melting-point metal plate having a melting point lower than the assumed combustion temperature of the combustion section 16. The first plate 14 is formed from a low-melting-point metal having a predetermined melting point. The low-melting-point metal of the first plate 14 is formed from a metal that melts at a relatively low temperature, or an alloy thereof. Examples of low-melting-point alloys include Wood's alloy, Rose's alloy, Field's alloy, Sn-Pb eutectic solder, and lead-free solder. Examples of elemental metals that make up the low-melting-point metal include tin, bismuth, and lead. The first plate 14 is formed from a metal whose melting point is within the range of 70°C to 350°C. By forming the first plate 14 from a metal whose melting point is within the range of 70°C to 350°C, the heat generated by the combustion of the combustion section 16 makes it easier to reliably melt the first plate 14. This makes it easier to form holes H in the first plate 14, and makes it easier to form an introduction path through which the introduced material D of the containment section 18 is introduced into the hard disk 50 via the first plate 14. As a result, it becomes easier for the introduced material D to reach the platter in the hard disk 50, making it easier to cause the platter to malfunction.

[0025] The combustion section 16 is placed on the first plate 14. The combustion section 16 is formed in a cylindrical shape. The combustion section 16 is formed in a circular shape when viewed from above. The combustion section 16 is formed in a square shape when viewed from the side. The combustion section 16 is formed in a rectangular shape when viewed from the side. The diameter of the combustion section 16 is, for example, a diameter within the range of 5 mm to 15 mm. The thickness of the combustion section 16 is, for example, a thickness within the range of 0.5 mm to 5 mm. By forming the combustion section 16 with a thickness within the range of 0.5 mm to 5 mm, it is possible to suppress the heat generated by the combustion of the combustion section 16 from escaping to the outside through the gap between the first plate 14 and the second plate 15. As a result, it becomes easier to efficiently transfer the heat from the combustion section 16 to the first plate 14 and the second plate 15, making it easier to melt the first plate 14 and the second plate 15 and form holes H.

[0026] The diameter of the horizontal cross-section of the combustion section 16 is constant from the bottom to the top of the combustion section 16. The top surface of the combustion section 16 is flat. The bottom surface of the combustion section 16 is flat. The top and bottom surfaces of the combustion section 16 are parallel. Five combustion sections 16 are arranged on the first plate 14. Any number of combustion sections 16, for example, three, may be arranged on the first plate 14. The combustion sections 16 are arranged in numbers ranging from two to five. By arranging the combustion sections 16 in numbers ranging from two to five, multiple locations on the first plate 14 and the second plate 15 can be heated, making it easier to form multiple holes in the first plate 14 and the second plate 15. This makes it easier for air inside the hard disk 50 to escape to the outside through the multiple holes H, and reduces resistance from the internal air when introducing the material D from the storage section 18 into the hard disk. As a result, it becomes easier to smoothly introduce the material D into the hard disk 50. Furthermore, only one combustion chamber 16 may be provided. Since only a single hole is formed in the first plate 14 and the second plate 15, it has the advantage of being relatively easy to construct.

[0027] The combustion section 16 may be arranged, for example, with one combustion section 16 at the center and four combustion sections 16 arranged at equal intervals at the vertices of a square centered on one combustion section 16. When multiple combustion sections 16 are arranged, for example, multiple combustion sections 16 may be arranged on the same straight line. Multiple combustion sections 16 are formed to a common height. The combustion section 16 is formed, for example, of a composite propellant. The composite propellant of the combustion section 16 comprises, for example, a combustion member containing synthetic rubber, a combustion aid containing metal powder, for example, aluminum powder, and an oxidizer that supplies the oxygen necessary for combustion. The combustion section 16 has the function of burning at a relatively high assumed combustion temperature, for example, a temperature of 2000°C to 2500°C. The combustion section 16 is not limited to this and may be composed of any combustion member, for example, black powder, smokeless powder, etc. The combustion section 16 is arranged so as to be in contact with the nichrome wire of the ignition device 17. The central axis X1 (see Figure 4) of the cylindrical combustion section 16 is positioned perpendicular to the first plate 14. The combustion section 16 is fixed to the first plate 14 or the second plate 15 by adhesive tape 34 (see Figure 3). The adhesive tape 34 is, for example, a vinyl tape with an adhesive surface. The adhesive tape 34 allows the combustion section 16 to be easily fixed to the first plate 14, etc. This allows the combustion section 16 to be stably positioned between the first plate 14 and the second plate 15 while suppressing displacement of the combustion section 16. In addition, fixing the combustion section 16 with adhesive tape 34 simplifies the assembly process. As a result, it becomes easier to burn the combustion section 16 while holding it in a predetermined position, and it becomes easier to form holes H in the first plate 14 and the second plate 15. The adhesive tape 34 may be made of tape made of other materials such as paper.

[0028] As a variation, the combustion section 16 may be placed in a recess formed in the first plate 14. The recess is formed, for example, by a cylindrical hole. The recess forms the same outer shape as the combustion section 16 directly below it, and its depth may be in the range of 1 mm to 5 mm. The combustion section 16 may be placed so as to be embedded in such a recess. By placing the combustion section 16 in a recess formed in the first plate 14, the heat generated by the combustion of the combustion section 16 is less likely to escape to the surroundings, and the heat from the combustion section 16 can be efficiently transferred to the first plate 14 and the second plate 15. Furthermore, by forming a recess in the first plate 14, the thickness of the first plate in the area where the combustion section is placed can be made relatively thinner. As a result, the first plate side melts earlier than the second plate side, making it easier to form holes H. Therefore, it becomes easier to sequentially form holes H in the first plate 14 and the second plate 15, making it easier to introduce the material D introduced in the storage section into the hard disk.

[0029] The ignition device 17 is configured to initiate combustion in the combustion section 16. The ignition device 17 is configured to ignite the combustion section 16, for example, a composite propellant, and initiate combustion. The ignition device 17 includes a heating section 17a, for example, made of wound nichrome wire. The heating section 17a of the ignition device 17 is positioned in contact with the combustion section 16. The heating section 17a of the ignition device 17 is positioned between the first plate 14 and the second plate. The ignition device 17 is connected to a second power supply unit 24 that supplies power to the ignition device 17 independently. The ignition device 17 is connected to the second power supply unit 24 via a power line 17b. The ignition device 17 is operated by a command from the actuator 30, and by energizing the heating section 17a, the nichrome wire is heated to a high temperature, for example, about 300°C to about 400°C, which ignites and causes combustion in the combustion section 16. As a variation, the ignition device 17 may use an ignition bulb, and by passing electricity through the ignition bulb, the ignition bulb may be ignited, and the combustion section 16 may be ignited by the ignition bulb.

[0030] The actuator 30 has a function that can control the ignition of the ignition device 17, for example. The actuator 30 may be positioned at a distance from the first plate 14, etc. When the ignition device 17 receives an operation command, it starts supplying power to the heating unit 17a for ignition of the combustion unit. When the ignition device 17 determines that it has not received an operation command, it is controlled not to supply power to the heating unit 17a. The ignition device 17 is electrically connected to the heating unit 17a and the second power supply unit 24. Note that all or part of the ignition device 17 may be formed by a control unit such as the memory of the personal computer 2. The ignition device 17 incorporates a CPU 40 and a storage device 41 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 17 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 17 stores a program that allows it to execute an operating mode in which it starts supplying power to the heating unit 17a when it receives an operation command. The ignition device 17 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 17a when it does not receive an operation command.

[0031] The second plate 15 is positioned above the combustion section 16. The second plate 15 is positioned so as to be in contact with the upper surface of the combustion section 16. When viewed from above, the second plate 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 plate 15 are the same as those of a so-called 3.5-inch standard hard disk drive. The thickness of the second plate 15 is within the range of 1 mm to 10 mm. The second plate 15 forms a flat, plate-like member with a nearly constant thickness. The second plate 15 is formed from a second low-melting-point metal having a melting point lower than the assumed combustion temperature of the combustion section 16. The second plate 15 is formed from a low-melting-point metal having a melting point at a predetermined temperature. The low-melting-point metal of the second plate 15 is formed from a metal that melts at a relatively low temperature, or an alloy thereof. Alloys that form low-melting-point metals include, for example, Wood's alloy, Rose's alloy, Field's alloy, Sn-Pb eutectic solder, and lead-free solder. Elemental metals that constitute low-melting-point metals include, for example, tin, bismuth, and lead. Therefore, the second plate 15 is formed from a metal whose melting point is within the range of 70°C to 350°C. By forming the second plate 15 from a metal with a melting point in the range of 70°C to 350°C, the heat generated by the combustion in the combustion section 16 makes it easier to reliably melt the second plate 15. This makes it easier to form holes H in the second plate 15, and easier to form an introduction path through which the introduced material D contained in the containment section 18 is introduced downwards through the second plate 15. As a result, it becomes easier to introduce the introduced material D into the hard disk 50, and it becomes easier to cause the platters in the hard disk 50 to malfunction.

[0032] The first plate 14 is positioned parallel to the second plate 15. The second plate 15 is formed and positioned such that, when viewed from above, its entirety roughly overlaps that of the first plate 14. The first plate 14 is formed to have a common rectangular outer shape with the second plate 15. This makes it easier to align the first plate 14 and the second plate 15 with each other, for example, by using a simple auxiliary plate, and allows each component to be stacked stably. Furthermore, by forming the first plate 14 and the second plate 15 with a common rectangular outer shape, it becomes easier to form them to have the same external dimensions as a hard disk drive, making it easier to place the information leakage suppression device in a drive bay inside a personal computer. The thickness of the first plate 14 is the same as the thickness of the second plate 15. Having the same thickness includes having thicknesses of approximately the same magnitude. For example, manufacturing tolerances of a few millimeters, for example, within the range of 1 mm to 5 mm, are included within the same thickness range. By making the thickness of the first plate 14 the same as the thickness of the second plate 15, the heat capacity and heat conduction state of the first plate 14 and the second plate 15 can be approximated. As a result, when heated by combustion in the combustion section 16, the rate at which holes H are formed and the shape of the holes H in the first plate 14 and the second plate 15 tend to be similar. Therefore, the positional relationship and opening shape of the holes H formed in the first plate 14 and the second plate 15 are stabilized, making it easier to introduce the material D introduced in the containment section 18 into the hard disk. Furthermore, the thickness of the first plate 14 may be less than the thickness of the second plate 15. For example, the thickness of the first plate 14 may be 2 mm and the thickness of the second plate 15 may be 5 mm. For example, the first plate 14 may be heated and melted more easily than the second plate 15. This makes it easier for holes H to be formed in the first plate 14 first, and prevents the introduction of the material D from the containment section 18 into the combustion section 16, which would inhibit the combustion of the combustion section 16 and thus prevent the formation of holes H in the first plate 14. This makes it easier to introduce the material D from the containment section 18 into the hard disk.

[0033] The melting point of the first plate 14 is the same as that of the second plate 15. Since the melting point of the first plate 14 is the same as that of the second plate 15, pores H of roughly the same size are stably formed in the first plate 14 and the second plate 15, making it easier to stably form pores H. The timing of pore formation H in the first plate 14 and the second plate 15 is more likely to be synchronized, allowing for stably formed pores H and enabling the introduction of the introduced substance D from the storage section 18 into the hard disk 50.

[0034] The containment section 18 is formed on the second plate 15. The containment section 18 contains the introduced substance D. The containment section 18 is formed in the shape of a box with an open top. The containment section 18 comprises a bottom surface 18a and side wall sections 18b that rise from the outer circumference of the bottom surface 18a. The bottom surface 18a is formed in the shape of a rectangular plate when viewed from above. The bottom surface 18a is arranged parallel to the second plate 15. The bottom surface 18a is arranged so as to be in contact with the upper surface of the second plate 15. The side wall section 18b is formed to extend vertically upward from the outer edge of the bottom surface 18a. The outer circumference of the bottom surface 18a is surrounded by the side wall section 18b. As a result, the containment section 18 forms a containment space 18c surrounded by the bottom surface 18a and the side wall section 18b. The introduced substance D is contained in the containment space 18c. The housing section 18 may be formed of, for example, resin. For example, the housing section 18 may be formed of a resin case. By forming the housing section 18 of resin, a part of the housing section 18 melts due to the heat generated by the combustion of the combustion section 16, making it easier to form an opening, and the introduced substance D in the housing space 18c is easily introduced downward through the holes H formed in the second plate 15. Also, by forming the housing section 18 of a resin case, the housing section 18 can be formed relatively easily. The housing section 18 has a capacity that allows the introduced substance D to flow into the hard disk and contaminate and damage the platter 53, etc. A wide area of ​​the platter 53 can be efficiently rendered unusable. The upper opening of the housing section 18 forms a rectangular opening and is watertightly closed by the third plate 19.

[0035] The melting point of the first plate 14 may be lower than that of the second plate 15. For example, different low melting points are formed by using different metals for the first plate 14 and the second plate 15. Since the melting point of the first plate 14 is lower than that of the second plate 15, the formation timing of the holes H in the first plate 14 can be earlier than the formation timing of the holes H in the second plate 15. This reduces the possibility of events occurring where, if holes H are formed on the second plate 15 side first, liquid in the containment section 18 flows in and inhibits combustion in the combustion section 16. In addition, the size of the holes H in the first plate tends to be larger than the size of the holes H in the second plate, making it easier to introduce the introduced substance D from the containment section into the hard disk.

[0036] The storage unit 18 may contain, for example, a liquid containing a surfactant as the introduced substance D. By storing a liquid containing a surfactant as the introduced substance D in the storage unit 18, the introduced substance D can be made to spread more easily on the surface of the platter 53 when it flows into the hard disk 50. As a result, the liquid containing the surfactant is more likely to adhere to the surface of the platter 53, which can adversely affect the rotation of the platter 53 and the reading operation by the magnetic head 55. Consequently, it is possible to make the platter 53 and other components in the hard disk 50 malfunction and make it difficult to read the information in the hard disk 50.

[0037] The storage section 18 may contain a liquid as the introduced substance D. By containing a liquid as the introduced substance D in the storage section 18, the liquid can be more easily allowed to flow into the hard disk 50 through the holes H formed in the first plate 14 and the second plate 15. This makes it easier for the liquid to adhere to the platter 53 and magnetic head 55 inside the hard disk 50, which can adversely affect the rotational movement of the platter 53 and the reading operation of the magnetic head 55. As a result, it can easily cause the platter 53 and other components inside the hard disk to malfunction, making it difficult to read the information inside the hard disk 50.

[0038] The storage section 18 may contain a liquid containing an adhesive substance or a gel-like material containing an adhesive substance as the introduced substance D. By storing a liquid containing an adhesive substance or a gel-like material containing an adhesive substance as the introduced substance D in the storage section 18, the introduced substance D can be made to adhere more easily to the platter 53, magnetic head 55, etc., when introduced into the hard disk 50. This makes it easier for the adhesive substance to adhere to the surface of the platter 53 or the magnetic head 55, etc., and to hinder rotational and reading operations. In addition, the adhesive substance makes it more difficult to remove the introduced substance D. As a result, it is easier to cause malfunctions in the platter 53, etc., inside the hard disk, and it is easier to make it difficult to read the information inside the hard disk 50.

[0039] The storage section 18 may contain powder as the introduced substance D. By storing powder as the introduced substance D in the storage section 18, the powder can be introduced into the hard disk through the holes H formed in the first plate 14 and the second plate 15. This makes it easier for the powder to enter the movable parts of the hard disk, such as the platter 53 and the magnetic head 55, and can easily interfere with the rotational movement of the platter 53 and the reading operation of the magnetic head 55. In addition, because the powder can easily diffuse widely into the internal mechanism, it can easily cause malfunctions in the internal mechanism. As a result, it can easily cause malfunctions in the platter 53 and other parts of the hard disk, making it difficult to read information inside the hard disk.

[0040] The third plate 19 is positioned to form a lid for the housing section 18. The third plate 19 is formed in a flat shape. The third plate 19 is formed to cover the rectangular opening at the top of the housing section 18. When viewed from above, the third plate 19 is formed in a rectangular shape. The third plate 19 forms 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 third plate 19 are the same as those of a so-called 3.5-inch standard hard disk drive. The third plate 19 is made of stainless steel metal. Screw holes (not shown) are formed near the four corners of the third plate 19, and screws (not shown) are inserted into each of them, passing through the third plate 19, housing section 18, second plate 15, and first plate 14 to fasten to the base body 51, firmly fastening the third plate 19 to the housing section 18, the second plate 15, and the first plate 14 to the base body 51. The thickness (height H) of the structure into which these components are assembled is, for example, 2.5 cm to 5 cm.

[0041] In this configuration, the combined form of the hard disk 50 base body 51, first plate 14, second plate 15, housing section 18, and third plate 19 is formed to have the same left-right and front-back external dimensions as a 3.5-inch standard hard disk drive. When viewed from above, the base body 51, first plate 14, second plate 15, housing section 18, and third plate 19 are formed to have a common rectangular external shape. Therefore, these, for example, five 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, making it easy for the user to handle.

[0042] The information leakage suppression device 1 further includes an ignition device 17 for igniting the combustion section 16, a second power supply device 24, and an operating device 30.

[0043] The second power supply unit 24 supplies power to the ignition device 17 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 17 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 17 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.

[0044] 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 17. 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 17 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 17 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 17 by receiving a predetermined activation signal from an external source, and transmit the activation signal to the ignition device 17. This makes it possible for an administrator to activate the ignition device 17 from a remote location to prevent information leakage.

[0045] The ignition device 17 is configured to ignite the combustion section 16 and initiate combustion of composite propellant or the like. The ignition device 17 ignites the combustion section 16, which is sandwiched between the first plate 14 and the second plate 15. The ignition device 17 includes a heating section 17a, for example, made of wound nichrome wire. The heating section 17a is positioned in contact with the combustion section 16. The ignition device 17 is connected to a second power supply unit 24, which supplies power to the ignition device 17 independently. The ignition device 17 is connected to the second power supply unit 24 via a power line 17b. In Figure 4, the power line 17b is shown by a dashed line. The ignition device 17 is operated by a command from the actuator 30, and the nichrome wire is heated by energizing the heating section 17a, reaching a high temperature, for example, about 300°C to about 400°C, which ignites the combustion section 16. The ignition device 17 can ignite multiple combustion chambers 16 at approximately the same time by command from the actuator 30. While it is preferable for the multiple combustion chambers 16 to burn at approximately the same time, even if the combustion timing of the multiple combustion chambers 16 is staggered, a certain effect will be achieved as long as the holes H are formed. Therefore, the combustion timing of the combustion chambers 16 and the timing of the formation of the holes H may be staggered. As a variation, the ignition device 17 may use an ignition bulb, and by passing electricity through the ignition bulb, the ignition bulb may be ignited, and the combustion section 16 may be ignited by the ignition bulb.

[0046] The actuator 30 has a function that can control the ignition of the ignition device 17, for example. When the ignition device 17 receives an operation command, it starts supplying power to the heating unit 17a for ignition of the combustion unit 16. When the ignition device 17 determines that it has not received an operation command, it is controlled not to supply power to the heating unit 17a. The actuator 30 may be located, for example, within the case 3, at a distance from the hard disk, etc. The ignition device 17 is electrically connected to the heating unit 17a and the second power supply unit 24. In addition, all or part of the ignition device 17 may be formed by a control unit such as the memory of the personal computer 2. The ignition device 17 incorporates a CPU 40 and a storage device 41 such as memory, and controls connected devices to execute predetermined controls based on a predetermined control program recorded in the memory, etc. The ignition device 17 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 17 stores a program that allows it to execute an operating mode in which it starts supplying power to the heating unit 17a when it receives an operation command. The ignition device 17 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 17a when it does not receive an operation command.

[0047] Next, with reference to Figure 3, the manufacturing method and arrangement method of the information leakage suppression device 1 will be explained.

[0048] First, the information leakage suppression device 1 is prepared by first preparing the hard disk 50, the first plate 14, the second plate 15, the housing section 18, the third plate 19, the ignition device 17, the second power supply device 24, and the operating device 30. Next, prepare a hard disk drive 50, which is a so-called 3.5-inch hard disk. The hard disk drive 50 is electrically connected to the motherboard 6 and configured to be used in the same way as a normal hard disk drive.

[0049] The first plate 14 is attached in place of the metal plate on the top of the hard disk 50. That is, the base body 51 and the first plate 14 form a hard disk case, and the platter 53 and the like are placed inside. The first plate 14 is placed on top of the platter 53 of the hard disk 50. As an alternative, the first plate 14 may be attached from the beginning as the metal plate on the top of the hard disk 50.

[0050] Next, as shown in Figure 3, the second plate 15 is placed on top of the combustion section 16. The second plate 15 is positioned so as to be in contact with the upper surface of the combustion section 16. The second plate 15 is positioned parallel to the first plate 14. By positioning the first plate 14 parallel to the second plate 15, the heat generated by the combustion in the combustion section 16 is more easily transferred uniformly to the first plate 14 and the second plate 15. This makes it easier to stabilize the positional relationship and shape of the holes H formed in the first plate 14 and the second plate 15, and makes it easier to introduce the material D introduced in the storage section 18 into the hard disk.

[0051] Next, the storage section 18 is placed on the second plate 15. The storage section 18 is positioned so as to be in contact with the upper surface of the second plate 15. The bottom surface 18a of the storage section 18 is positioned so as to be parallel to the second plate 15. This ensures that the storage section 18 is stably supported on the upper surface of the second plate 15. Also, when holes H are formed in the second plate 15 due to the combustion of the combustion section 16, the resin on the bottom surface 18a of the storage section 18 melts at approximately the same time, forming holes H. The storage section 18 has a storage space 18c for storing the introduced substance D, and the introduced substance D is later stored in the storage space 18c. Next, the introduced substance D is placed in the storage space 18c of the storage section 18. The introduced substance D is placed in the storage space 18c, for example, with the third plate 19 removed. The introduced substance D may be, for example, a liquid containing a surfactant, a liquid containing a sticky substance, a gel-like material containing a sticky substance, or a powder. A predetermined amount of the introduced substance D is placed in the containment space 18c of the containment section 18. This allows the introduced substance D to flow downward through the openings (holes H) formed in the first plate 14, the second plate 15, and the bottom surface 18a of the containment section 18 by the subsequent combustion of the combustion section 16, making it easier for it to be introduced into the hard disk 50.

[0052] Next, the third plate 19 is placed on top of the housing section 18. The third plate 19 is positioned to cover the upper opening of the housing section 18. The third plate 19 is positioned so as to roughly coincide with the outer shape of the housing section 18 when viewed from above. The third plate 19 is positioned to close the upper opening of the housing section 18. As a result, the housing space 18c of the housing section 18 is sealed watertight by the third plate 19, preventing the introduced substance D placed in the housing space 18c of the housing section 18 from leaking out to the outside. Each component is assembled together. This forms the housing structure of the information leakage suppression device 1.

[0053] Next, the base body 51 of the hard disk 50, the first plate 14, the second plate 15, the housing section 18, and the third plate 19 are assembled and fixed together. From above the third plate 19, screws (not shown) are inserted into screw holes (not shown) formed in the base body 51, passing through the third plate 19, housing section 18, second plate 15, and first plate 14, and these components are fastened together by the screws. As a result, the third plate 19, housing section 18, second plate 15, combustion section 16 sandwiched between the second plate 15 and the first plate 14, first plate 14, and base body 51 are firmly tightened and fixed together as a single unit. This allows the information leakage suppression device 1 to be easily assembled as a housing structure. The information leakage suppression device 1 can be placed, for example, in a 3.5-inch drive bay 9 formed inside the case 3 of a personal computer 2.

[0054] Next, the wires 32 of the actuator 30 are wired to the designated locations. The wires 32 are wired in a loop from the actuator 30 inside the case 3 of the personal computer 2, through components outside the personal computer. This ensures that if someone tries to take the personal computer 2 along with the case 3, the loop circuit of the wires 32 will be cut, and the actuator 30 will activate. Next, the actuator 30 and the ignition device 17 are electrically connected, and the ignition device 17 is put into a standby state. This sets the ignition device 17 to be able to ignite the combustion section 16 if the actuator 30 detects an abnormality. Furthermore, the ignition device 17 is connected to receive power from the second power supply unit 24. This ensures that the ignition device 17 can operate even if the power to the personal computer 2 is cut off.

[0055] Next, with reference to Figures 3, 4, and 6, the operation of the information leakage suppression device 1 in causing malfunctions or rendering the platters in the hard disk 50 unusable will be explained. Malfunctions include, for example, failure to read hard disk information or, even if reading is possible, abnormal information data being read. Unusability includes, for example, the inability to read hard disk information.

[0056] As shown in Figure 6, the operation by the information leakage suppression device 1 to cause malfunction of the platter 53 and magnetic head 55 in the hard disk 50 will be described. When the actuator 30 (see Figure 1) outputs an activation signal, the ignition device 17 activates and the ignition of the combustion section 16 begins. The ignition device 17 starts heating multiple combustion sections 16 by energizing the heating section 17a that is in contact with the combustion section 16. The ignition device 17 starts heating each of the five combustion sections 16 at the same time. As a result, multiple combustion sections 16 are heated at approximately the same time and combustion begins at the same time. Because multiple combustion sections 16 start combustion at approximately the same time, heat is more easily transferred uniformly to the first plate 14 and the second plate 15. In addition, the timing of the formation of holes H in the first plate 14 and the second plate 15 is more likely to be simultaneous. Therefore, the possibility of liquid flowing in from some holes H and acting on combustion sections 16 at other locations can be reduced. In this way, the openings of the first plate 14 and the second plate 15 are stably formed, making it easier for the introduced substance D in the storage section 18 to be introduced into the hard disk 50.

[0057] Next, the combustion in the combustion section 16 heats the first plate 14 and the second plate 15. When the combustion section 16 burns, the corresponding portion of the first plate 14 located below the combustion section 16 is heated and becomes hot. Since the first plate 14 is made of a low-melting-point metal having a melting point lower than the assumed combustion temperature of the combustion section 16, when the temperature of the heated portion reaches its melting point, the metal of the first plate 14 melts. As a result, a hole H (see Figure 6) is formed in the portion of the first plate 14 directly below the combustion section 16, for example, in a circular shape.

[0058] Furthermore, the combustion in the combustion section 16 also heats the corresponding portion of the second plate 15 directly below the combustion section 16. Since the second plate 15 is made of a low-melting-point metal having a melting point lower than the assumed combustion temperature of the combustion section 16, when the temperature of the heated portion reaches its melting point, the metal of the second plate 15 melts. As a result, holes H are formed, for example, in the portion of the second plate 15 directly above the combustion section 16. Due to the arrangement of multiple combustion sections 16, multiple holes H are formed in the first plate 14 and the second plate 15, corresponding to the number of combustion sections 16.

[0059] Next, the heat generated by the combustion in the combustion section 16 is transferred to the housing section 18. Since the housing section 18 is a case made of, for example, resin, a part of the housing section 18 melts relatively easily due to the high temperature heat generated by the combustion in the combustion section 16, and a hole H is formed. For example, a circular hole H is formed in the bottom surface 18a of the housing section 18 above the combustion section 16. When a hole H is formed in the bottom surface 18a of the housing section 18, the introduced substance D contained in the housing space 18c of the housing section 18 flows out downward. As shown by arrow F1, the introduced substance D moves downward through the holes H formed in the second plate 15 and the first plate 14 and flows into the interior of the hard disk 50. The introduced substance D flows, for example, spreading inside the hard disk 50 and adhering to the platter 53, magnetic head 55 and other internal components. This introduces liquid and solid into the interior of the hard disk 50. As a result, the introduced substance D reaches the platter 53 and other components inside the hard disk 50, contaminating or damaging the surface of the platter 53. Furthermore, the platter 53 and the magnetic head 55 that reads the data on the platter 53 can also be prone to malfunction due to contamination or damage. As a result, it becomes difficult to read the information recorded on the platter 53, and information leakage from the hard disk 50 can be suppressed.

[0060] For example, the introduced substance D may be a liquid containing a surfactant, such as a detergent solution. When a liquid containing a surfactant flows into the hard disk 50, it is formed to easily adhere to the surface of the platter 53. As a result, dirt adheres to the magnetic recording layer formed on the surface of the platter 53, making it difficult for the magnetic head 55 to read the data. In addition, because a liquid containing a surfactant has the property of easily spreading inside the hard disk 50, it is likely to adhere to a wide area of ​​multiple platters 53. As a result, the possibility of difficulty in reading recorded information over a wide area of ​​the platter 53 increases, and information leakage from within the hard disk 50 can be suppressed.

[0061] As a variation, the introduced substance D may be a gel-like material containing an adhesive substance. When introduced into the hard disk 50, the gel-like material containing an adhesive substance has the property of easily adhering to the surface of the platter 53 or the magnetic head 55, etc. This makes it easier for the movement of the magnetic head 55 to be hindered or for the magnetic head 55 to adhere to the surface of the platter 53. In addition, the gel-like material containing an adhesive substance may adhere not only to the surface of the platter 53 but also to the shaft and the hard disk case, creating operational resistance, which may hinder the rotation of the platter 53. Thus, when a gel-like material containing an adhesive substance is introduced into the hard disk 50, the possibility of difficulty in the rotation of the platter 53 and data reading by the magnetic head 55 increases, thereby suppressing information leakage from within the hard disk 50.

[0062] As a variation, the introduced substance D may be sand or powder. When sand or powder is introduced into the hard disk 50, it easily gets into the surface of the platter 53 and around the magnetic head 55. This can cause the magnetic recording layer formed on the surface of the platter 53 to be scratched or damaged. Also, if sand or powder gets between the platter 53 and the magnetic head 55, the rotational movement of the platter 53 may be hindered or the scanning movement of the magnetic head 55 may be hindered. In this way, the introduction of sand or powder into the hard disk 50 makes the surface of the platter 53 more susceptible to damage and increases the likelihood that data reading by the magnetic head 55 will become difficult. This helps to suppress information leakage from within the hard disk 50.

[0063] As a variation, the introduced substance D may be a substance that is difficult for people to handle directly, such as a liquid containing a pungent or rotten odor, or components that are difficult to touch directly with the hands. When a liquid containing a substance that is difficult for people to handle directly is introduced into the hard disk 50, care is required when handling the introduced substance D, making it difficult for workers to easily remove the introduced substance D from the hard disk 50. In this way, by using a liquid containing a substance that is difficult for people to handle directly as the introduced substance D, it becomes difficult to remove the introduced substance D introduced into the hard disk 50. As a result, it becomes difficult to easily remove the introduced substance D that has adhered to the surface of the platter 53, making it difficult to restore the internal structure of the hard disk 50. This makes it difficult to recover the information recorded on the platter 53, and thus more reliably suppresses the leakage of information from the hard disk 50.

[0064] An example of one embodiment of the present invention may be provided in the following embodiments.

[0065] (1) An information leakage suppression device for suppressing the leakage of information from a hard disk, comprising: a base body that forms the base of the hard disk; a first plate that forms the top plate of the hard disk; a combustion section disposed on the first plate; an ignition device for starting combustion of the combustion section; a second plate disposed above the combustion section; a storage section formed on the second plate and for storing an introduced substance; and a third plate that forms the lid of the storage section, wherein the first plate is made of a first low-melting-point metal having a melting point lower than the assumed combustion temperature of the combustion section, and the second plate is made of a second low-melting-point metal having a melting point lower than the assumed combustion temperature of the combustion section.

[0066] (2) The information leakage suppression device according to (1), wherein the melting point of the first plate is the same as the melting point of the second plate.

[0067] (3) The information leakage suppression device according to (1), wherein the melting point of the first plate is lower than the melting point of the second plate.

[0068] (4) The information leakage suppression device described in (1), wherein the first plate is arranged parallel to the second plate.

[0069] (5) The information leakage suppression device according to (1), wherein the first plate is formed to have a rectangular outer shape common to that of the second plate.

[0070] (6) The information leakage suppression device according to (1), wherein the thickness of the first plate is the same as the thickness of the second plate.

[0071] (7) The information leakage suppression device according to (1), wherein the thickness of the first plate is less than the thickness of the second plate.

[0072] (8) The information leakage suppression device according to (1), wherein the first plate is made of a metal having a melting point in the range of 70°C to 350°C.

[0073] (9) The information leakage suppression device according to (1), wherein the second plate is made of a metal having a melting point in the range of 70°C to 350°C.

[0074] (10) The information leakage suppression device according to (1), wherein the combustion section is fixed to the first plate or the second plate by adhesive tape.

[0075] (11) The information leakage suppression device according to (1), wherein the combustion section is formed to a thickness within the range of 0.5 mm to 5 mm.

[0076] (12) The information leakage suppression device according to (1), wherein the combustion section is arranged in a number of units ranging from 2 to 5.

[0077] (13) The information leakage suppression device according to (1), wherein the combustion section is arranged in a recess formed in the first plate.

[0078] (14) The information leakage suppression device according to (1), wherein the housing is formed by a resin case.

[0079] (15) The information leakage suppression device according to (1), wherein the containment section contains a liquid containing a surfactant as the introduced substance.

[0080] (16) The information leakage suppression device according to (1), wherein the containment section contains a liquid as the introduced substance.

[0081] (17) The information leakage suppression device according to (1), wherein the containment section contains a liquid containing an adhesive substance or a gel-like material containing an adhesive substance as the introduced substance.

[0082] (18) The information leakage suppression device according to (1), wherein the containment section contains powder as the introduced substance.

[0083] 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.

[0084] As a variation, the arrangement of the combustion section 16 can be arbitrarily changed. That is, by changing the arrangement of the combustion section 16, the arrangement of the holes H formed in the first plate 14 and the second plate 15 can also be changed to any position. For example, multiple combustion sections 16 may be arranged in a circle. By arranging the combustion sections 16 in a circle in this way, the holes H formed by the combustion of the combustion sections 16 are also formed on the circumference. This makes it easier to introduce the introduced substance D flowing in from the storage section 18 over a wide area along the circumference of the platter 53 in the hard disk 50. As a result, it becomes easier to adhere the introduced substance D to a wide area of ​​the platter 53, making it more difficult to read the information recorded on the platter 53.

[0085] As another modification, multiple combustion units 16 may be arranged in a linear pattern. By arranging multiple combustion units 16 in a linear pattern, the holes H formed in the first plate 14 and the second plate 15 by the combustion of the combustion units 16 are also formed in a linear pattern. This makes it easier to introduce the introduced substance D flowing out from the containment unit 18 over a wide area along a predetermined direction within the hard disk 50, even with a small number of combustion units 16. Therefore, it becomes more efficient to make it difficult to read the information recorded on the platter 53. In addition, the arrangement of the combustion units 16 and the ignition device, etc., can be made simpler.

[0086] As another variation, the number of combustion sections 16 can also be changed. Increasing the number of combustion sections 16 also increases the number of holes H formed in the first plate 14 and the second plate 15, making it easier to introduce the introduced substance D in the containment section 18 into the hard disk 50. On the other hand, even if the number of combustion sections 16 is reduced, the function of introducing the introduced substance D into the hard disk 50 can be maintained by appropriately adjusting the placement of the combustion sections 16. By appropriately changing the number of combustion sections 16 in this way, the range and amount of introduced substance D into the hard disk 50 can be adjusted, and the effect and degree of making it difficult to read the information recorded on the platter 53 can be adjusted. Furthermore, since the first plate 14 and the second plate 15 are plates of low-melting-point metal, it is relatively easy to change the placement and number of combustion sections 16, thereby improving the degree of design freedom. [Explanation of symbols]

[0087] 1: Information leakage control device 3: Case 14: First Plate 15: Second Plate 16: Combustion section 17:Ignition device 18: Detention Unit 19: Third Plate 34: Adhesive tape 50: Hard disk 51: Base body D: Introduced substance

Claims

1. A device for suppressing information leakage from hard disks, The base body that forms the base of the hard disk, A first plate forming the top panel of the aforementioned hard disk, A combustion section is arranged on the first plate, An ignition device for starting combustion in the aforementioned combustion section, A second plate positioned above the combustion section, A containment section formed on the second plate and containing the introduced substance, It comprises a third plate that forms the lid of the housing section, The first plate is formed of a first low-melting-point metal having a melting point lower than the assumed combustion temperature of the combustion section. The second plate is formed of a second low-melting-point metal having a melting point lower than the assumed combustion temperature of the combustion section, in an information leakage suppression device.

2. The information leakage suppression device according to claim 1, wherein the melting point of the first plate is the same as the melting point of the second plate.

3. The information leakage suppression device according to claim 1, wherein the melting point of the first plate is lower than the melting point of the second plate.

4. The information leakage suppression device according to claim 1, wherein the first plate is arranged parallel to the second plate.

5. The information leakage suppression device according to claim 1, wherein the first plate is formed to have a common rectangular outer shape with the second plate.

6. The information leakage suppression device according to claim 1, wherein the thickness of the first plate is the same as the thickness of the second plate.

7. The information leakage suppression device according to claim 1, wherein the thickness of the first plate is smaller than the thickness of the second plate.

8. The information leakage suppression device according to claim 1, wherein the first plate is made of a metal having a melting point in the range of 70°C to 350°C.

9. The information leakage suppression device according to claim 1, wherein the second plate is made of a metal having a melting point in the range of 70°C to 350°C.

10. The information leakage suppression device according to claim 1, wherein the combustion section is fixed to the first plate or the second plate by adhesive tape.

11. The information leakage suppression device according to claim 1, wherein the combustion section is formed to a thickness within the range of 0.5 mm to 5 mm.

12. The information leakage suppression device according to claim 1, wherein the combustion section is arranged in a number ranging from two to five.

13. The information leakage suppression device according to claim 1, wherein the combustion section is arranged in a recess formed in the first plate.

14. The information leakage suppression device according to claim 1, wherein the housing section is formed by a resin case.

15. The information leakage suppression device according to claim 1, wherein the containment section contains a liquid containing a surfactant as the introduced substance.

16. The information leakage suppression device according to claim 1, wherein the containment section contains a liquid as the introduced substance.

17. The information leakage suppression device according to claim 1, wherein the containment section contains a liquid containing an adhesive substance or a gel-like material containing an adhesive substance as the introduced substance.

18. The information leakage suppression device according to claim 1, wherein the containment section contains powder as the introduced substance.

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