JP2010218625A - Magnetic recording device - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To completely disable reading/writing of information from/to a magnetic recording device when it is discarded. <P>SOLUTION: The magnetic recording device 1 has a sealed container 21 in an enclosure case 2 and an insertion hole 28 on a cover 4 for inserting a needle 32 into the sealed container 21. In the sealed container 21, corrosive material 25 is housed. The hole is formed on the sealed container 21 by inserting the needle 32 into the enclosure case 2 when disposing of the magnetic recording device 1. The corrosive material 25 is let out from the hole and the magnetic recording surface of a magnetic disk 5 is destroyed, thereby it becomes impossible to read and write information from and to the magnetic disk 5. <P>COPYRIGHT: (C)2010,JPO&INPIT

Description

  The present invention relates to a magnetic recording apparatus.

  An example of the magnetic recording device is a hard disk used as a recording device such as a computer. In this type of magnetic recording apparatus, a magnetic head is attached to the tip of a rotatable arm via a suspension. The magnetic head has a slider on which a head element is mounted, and has a configuration for accessing data stored on a magnetic disk via the head element.

  Here, when discarding a magnetic recording apparatus such as a hard disk, it is necessary to completely erase the recorded information. This is to prevent information remaining in the magnetic recording apparatus from leaking to a third party. However, since the magnetic erasure method only overwrites and records magnetic information, there is a possibility that information cannot be completely erased. For this reason, it has been desired to mechanically destroy the magnetic recording medium of the magnetic recording apparatus at the time of disposal so that information cannot be read or written at all.

  Processing at the time of discarding a conventional magnetic recording apparatus will be described by taking a magnetic reader / writer using a magnetic card as a magnetic recording medium as an example. The magnetic reader / writer is provided with a magnetic head and a thermal head, and the magnetic card taken into the magnetic reader / writer is provided with a destructible layer in advance. Then, a magnetic recording device is formed on the breakable layer. When the magnetic card is to be discarded, the magnetic reader / writer breaks the breakable layer with a thermal head. As a result, the magnetic recording layer formed on the destructible layer is destroyed and information cannot be read or written.

International Publication No. WO 97/48096 Specification

However, the conventional apparatus configuration for discarding a magnetic card cannot be used for a hard disk in which a magnetic recording medium is accommodated in an enclosure case.
In addition, when the magnetic recording device is a hard disk, the method of magnetically erasing the information can be used when the magnetic recording device cannot supply power or the magnetic recording device does not operate even when power is supplied. Information recorded on the recording medium could not be erased.

  Further, when the magnetic recording device is a hard disk device used in a computer or the like, the information on the magnetic recording device can be obtained by taking out the hard disk device from the computer or the like and mounting it on another computer or taking out the magnetic recording medium. Therefore, it has been desired to make it impossible to completely read and write information from the magnetic recording device.

According to one aspect of the present application, a magnetic recording medium, a magnetic head that writes information to the magnetic recording medium, and reads information from the magnetic recording medium, and a case that houses the magnetic recording medium and the magnetic head And a housing portion that is disposed in the case and houses a destructive material that breaks the magnetic recording layer of the magnetic recording medium, and that releases the destructive material by being partially broken mechanically. A magnetic recording apparatus is provided.

The objects and advantages of the invention will be realized and attained by means of the elements and combinations particularly pointed out in the appended claims.
It should be understood that the foregoing general description and the following detailed description are exemplary and explanatory only and are not intended to limit the invention.

  According to the present invention, since the magnetic recording layer of the magnetic recording medium is destroyed by releasing the destructive material from the accommodating portion, reading of information from the magnetic recording medium can be reliably prevented.

FIG. 1 is a plan view of the magnetic recording apparatus according to the first embodiment of the present invention with the enclosure case cover removed. FIG. 2 is a cross-sectional view taken along the line II of FIG. FIG. 3 is a diagram for explaining the operation when the magnetic recording apparatus is discarded. FIG. 4 is a diagram illustrating an example of the shape of a needle. FIG. 5 is a cross-sectional view showing an example of the destruction device. FIG. 6 is a cross-sectional view showing a modified example of the destruction device. FIG. 7 is a cross-sectional view showing a modified example of the destruction device. FIG. 8 is a diagram showing the results of the flying test of the magnetic head. FIG. 9 is a partial cross-sectional view of a magnetic recording apparatus according to the second embodiment of the present invention. FIG. 10 is a diagram showing the results of a magnetic head flying test. FIG. 11 is a plan view of a modification of the magnetic recording apparatus. 12 is a cross-sectional view taken along line II-II in FIG.

  Preferred embodiments of the present invention will be described with reference to the drawings. In the drawings, similar components are given the same reference numerals.

(First embodiment)
FIG. 1 shows a plan view of a hard disk device as an example of a magnetic recording device. Here, the state where the cover of the enclosure case is removed is shown. FIG. 2 is a cross-sectional view taken along the line II of FIG.

The magnetic recording apparatus 1 includes an enclosure case 4 including an enclosure body 2 and a cover 3 that closes an opening at the top of the enclosure body 2.
In the enclosure main body 2, a magnetic disk 5 as a magnetic recording medium is rotatably arranged by a spindle motor at substantially the center of the internal space. Further, a carriage arm 6 is attached in the enclosure body 2 so as to be rotatable about a rotation shaft 7. The carriage arm 6 has a leaf spring-like suspension 8, and a magnetic head 9 is attached to the tip of the suspension 8. The magnetic head 9 is configured to read information on the magnetic disk 5 and write information to the magnetic disk 5.

Further, a control device 10 is mounted on the enclosure body 2. The control device 10 controls operations of the magnetic recording device 1 such as rotation control of the rotary shaft 7. For example, when the control device 10 rotates the rotary shaft 7, the carriage arm 6 rotates above the magnetic disk 3. As a result, the magnetic head 9 moves in the track width direction of the magnetic disk 5 and is loaded onto a desired track.

  Here, the enclosure main body 2 is composed of a bottom plate and a wall surface surrounding the bottom plate, and the central portion has a concave shape. Further, an airtight container 21 serving as a storage portion is fixed to one corner 2A close to the magnetic disk 5 among the four corners formed by the bottom plate and the wall surface of the enclosure body 2. As shown in FIG. 2, the sealed container 21 includes a bottomed cylindrical container body 22 and a lid 23 that seals the opened end of the container body 22, and the bottom of the container body 22 is made of, for example, an adhesive. It is fixed to the enclosure body 2. The lid 23 has a thickness and strength that can be broken by the breaking device 31. Such a sealed container 21 is manufactured from, for example, a resin such as polyethylene or a metal such as thin aluminum.

  Further, a corrosive substance 25 is accommodated in the sealed container 21 as a destructive substance. Examples of the corrosive substance 25 include acidic substances such as acetic acid, trifluoroacetic acid, hydrochloric acid, and tetrafluoropropionic acid, and alkaline substances such as ammonia. The corrosive substance 25 is preferably a liquid having a high vapor pressure at room temperature, that is, a volatile liquid. Furthermore, it is desirable that the substance has no or little influence on the human body. The corrosive substance 25 may be solid as long as it is highly volatile and can corrode the magnetic recording layer of the magnetic disk 5.

  An insertion hole 27 is formed in the cover 3 of the enclosure case 4 so as to correspond to the bonding position of the sealed container 21. The center position of the insertion hole 27 is matched with the center of the lid 23 of the sealed container 21. The center position of the insertion hole 27 does not necessarily need to coincide with the center as long as it is on the lid 23.

  The size of the insertion hole 27 is a size that allows the destruction device 31 to be inserted, and has a diameter of 1 mm to 3 mm, for example. Further, the insertion hole 27 is closed with a partition wall 28. The partition wall 28 is made of an airtight thin film and has a thickness and strength that can be broken by the breaking device 31. By providing the partition wall 28, foreign matter can be prevented from entering the inside of the magnetic recording apparatus 1 through the insertion hole 28. Further, when the destruction device 31 is used, the partition wall 28 is destroyed, so that the use of the destruction device 31 can be confirmed from the outside. The hard disk device 1 may be provided with only the insertion hole 27 without providing the partition wall 28.

  As shown in FIG. 3, the destruction device 31 has a needle 32 having a sharp tip. The opening member has a shape capable of forming a hole having a sufficient size to allow the corrosive substance 25 to flow out to the lid 23 of the sealed container 21.

  Here, as illustrated in FIG. 4, a concave portion 33 that protrudes inward may be formed at the distal end portion of the needle 32. In this case, the cross-sectional shape of the tip portion of the needle 32 is a polygon such as a triangle or a quadrangle, or a star shape. As a result, a gap is easily formed between the needle 32 and the lid 23 of the sealed container 21, and corrosion occurs through the gap formed by the concave portion 33 of the needle 32 and the lid 23 even when the needle 32 is stuck in the lid 23. The substance 25 comes out easily.

  Although not shown in the figure, when the notch is provided in only a part of the needle 32 or when the needle 32 is inserted into the sealed container 21 by providing a hole in the needle 32, the inside of the sealed container 21 and the enclosure body 2 are cut off. You may make it communicate through a notch or a hole. In these cases, even if the needle 32 is stuck in the lid 21, the corrosive substance 25 easily flows out through the notch or hole.

When the destruction device 31 is composed of only the needle 32, the operator inserts the needle 32 by hand during use to break the partition wall 28 and enter the enclosure case 4, and the lid 23 of the sealed container 21 is removed. To penetrate. When the needle 32 is manually inserted, it is preferable to make the head of the needle 32 on the hand side large in diameter or to provide a grip so that the needle 32 can be easily operated.

  Further, as illustrated in FIG. 5, the destruction device 31 may include a needle 32 and a drive device 34 that drives the needle 32. Examples of the driving device 34 include a configuration in which the end portion of the needle 32 exposed to the outside from the cover 3 is mechanically pushed with a lever, and a configuration in which the needle 32 is electrically driven using a solenoid coil. The destruction device 31 including the driving device 34 may be attached to the magnetic recording device 1 or may be attached to another device on which the magnetic recording device 1 is mounted.

  Furthermore, as shown in FIG. 6, the destruction device 31 may include a coil spring 35. The coil spring 35 is inserted between the head 32 </ b> A of the needle 32 and the cover 3, and biases the needle 32 in a direction away from the sealed container 21. At the time of disposal, the head 32 </ b> A of the needle 32 is pushed by the hand or the driving device 34 and the coil spring 35 is compressed and inserted into the sealed container 21. Thereafter, when the force input from the hand or the driving device 34 is released, the needle 32 is retracted from the sealed container 21 by the restoring force of the coil spring 35. By retracting the needle 32 from the lid 23, the opening area of the hole for releasing the corrosive substance 25 is increased, and the corrosive substance 25 is more easily released. Instead of the coil spring 35, a leaf spring may be used.

  Further, as illustrated in FIG. 7, the destruction device 31 may include a wall portion 40 that surrounds the insertion hole 28 outside the cover 3. The wall 40 protrudes from the cover 3 in a substantially annular shape, and an opening 40 </ b> A formed by the wall 40 is sealed with a plate material 41. Further, a needle 32 is attached to the inside of the plate material 41. The distal end portion of the needle 32 is inserted into the enclosure case 4 through the insertion hole 28. In such a destructive device 31, since the periphery of the insertion hole 28 is covered with the plate material 41, the partition wall 28 becomes unnecessary.

  When the needle 32 is pushed in, the plate material 41 is pushed toward the cover 3 by hand or the driving device 34. As a result, the needle 32 is stuck in the lid 23 of the sealed container 21 and the corrosive substance 25 is released. Here, when the plate material 41 is manufactured from a material that can be elastically deformed, the needle 32 returns to the original position when the force for pushing the needle 32 is removed, so that the needle 32 is removed from the lid 23 of the sealed container 21. As a result, the corrosive substance 25 is more easily released. The plate member 41 may be manufactured from a material that is broken when the needle 32 is pushed. In this case, since the plate material 41 is destroyed when the needle 32 is pushed in, it is possible to visually confirm that the data has been erased. For this reason, it becomes easy to confirm the destruction of the magnetic disk 5.

  The opening member is not limited to the needle 32 as long as the lid 23 of the sealed container 21 can be mechanically broken. For example, instead of the needle 31, a screw whose tip is sharply processed may be used. In this case, a groove corresponding to the screw is cut in the insertion hole 28 of the cover 3. In this way, the corrosive substance 25 can be released simply by pushing the screw while rotating it with a screwdriver. Further, even if the partition wall 28 is not provided, the sealing performance of the enclosure case 4 is enhanced, and the displacement between the screw and the lid 23 of the sealed container 21 is less likely to occur.

  The destruction device 31 may be attached to the magnetic recording apparatus 1 or may be provided separately from the magnetic recording apparatus 1. For example, when the destruction device 31 includes only the needle 32, a recess for accommodating the needle 32 may be provided in the cover 4 of the enclosure case 2, and the needle 32 may be accommodated in the recess when the destruction device 31 is not used. . Further, the destruction device 31 may be attached to another device on which the magnetic recording device 1 is mounted, for example, a personal computer. When attaching to another device, disposing work is facilitated by providing a switch or the like for driving the destruction device 31 in the other device.

Thus, by installing the sealed container 21 containing the corrosive substance 25, the magnetic disk 5
Since the magnetic recording layer can be chemically destroyed, the magnetic recording apparatus 1 can be safely discarded. Since the hermetic container 21 is broken by the needle 32 to release the corrosive substance 25, the magnetic recording layer of the magnetic disk 5 can be broken even when no power is supplied to the magnetic recording apparatus 1.

Example 1
The sealed container 21 was made of polyethylene, and the dimensions thereof were an inner diameter of 10 mm, a height of 2 mm, and a plate pressure of the lid 23 of 0.5 mm. The sealed container 21 was filled with trifluoroacetic acid as the corrosive substance 25 and fixed to the enclosure body 2 with an adhesive. The insertion hole 28 of the cover 3 was formed with an outer diameter of 1 mm directly above the sealed container 21.
Further, an AE (Acoustic Emission) sensor made of a piezoelectric element is attached to the magnetic head 9 so that a signal is output when the magnetic head 9 contacts the magnetic disk 5.

  FIG. 8 shows the result of a flying test of the magnetic head 9 using such a magnetic recording apparatus 1. The horizontal axis shows the passage of time, and the vertical axis shows the output of the AE sensor. The rotation speed of the magnetic disk 5 during the test was 7200 rpm. This flying test was conducted as a test for confirming that the magnetic recording layer of the magnetic disk 5 was destroyed when the magnetic recording apparatus 1 was discarded. That is, when the output of the AE sensor is at the ground level, it indicates that the magnetic head 9 is normally flying from the magnetic disk 5. When there is a signal output from the AE sensor, it indicates that the magnetic head 9 has not floated normally with respect to the magnetic disk 5, for example, that the magnetic head 9 is in contact with the magnetic disk 5.

  In 1800 seconds from the start of the test, when the needle 32 was inserted and a hole was made in the sealed container 21, the output of the AE sensor gradually increased. This is because the trifluoroacetic acid in the sealed container 21 diffuses into the magnetic recording device 1, corrodes from the surface of the magnetic disk 5 to the inside, and destroys the magnetic recording layer of the magnetic disk 5 by a chemical reaction. . Then, it is considered that the output of the AE sensor increased because the magnetic disk 5 and the magnetic head 9 contacted each other due to corrosion of the magnetic disk 5. As a result, it was found that the magnetic recording apparatus 1 can make reading and writing of magnetic recording information impossible.

(Second Embodiment)
As shown in FIG. 9, the magnetic recording apparatus 1 according to this embodiment has a sealed container 21 in which particles 51 are accommodated as destructive substances. As the particles 51, for example, solids having a diameter of about 100 μm, such as Altic powder, glass powder, and diamond powder, are used. Other apparatus configurations are the same as those in the first embodiment.

  In the magnetic recording apparatus 1, when the sealed container 21 is destroyed by the destruction device 31, the particles 51 can be released into the enclosure case 4. When electric power is supplied to the magnetic recording apparatus 1 to rotate the magnetic disk 5, convection is generated in the enclosure case 4, and the particles 51 are diffused in the enclosure case 4 due to the convection and adhere to the magnetic disk 5. 5 magnetic recording layer is destroyed.

  Here, when the particles 51 are used as the destructive material, it is necessary to rotate the magnetic disk 5 after the particles 51 can be released or to cause convection in the enclosure case 4 by other means. The magnetic recording device 1 may be left in a state where the lid 23 of the sealed container 21 is broken and the particles 51 can be emitted, and the magnetic recording layer of the magnetic disk 5 may be destroyed when power is supplied next time. .

In this magnetic recording apparatus 1, it is possible to mechanically destroy the magnetic recording layer of the magnetic disk 5 by installing the sealed container 21 containing the particles 51, so that the magnetic recording apparatus 1 can be safely discarded. It becomes possible.

(Example 2)
FIG. 10 shows the results of the flying test of the magnetic head 9. Altic powder was used for the particles 51, and other test conditions and apparatus configuration were the same as in the first embodiment. When a hole was made in the sealed container 21 using the needle 32 in 1800 seconds from the start of the test, the output of the AE sensor increased. This is because the Altic powder in the sealed container 21 enters the gap between the magnetic head 9 and the magnetic disk 5 to cause biting, and the magnetic disk 5 is damaged. As a result, reading and writing of the magnetic recording information 1 became impossible.
The use of the particles 51 shortened the time required for the magnetic head 9 to collide with the magnetic disk 5 as compared with the result of the flying test shown in FIG.

In addition, the modification of each embodiment is demonstrated below.
As shown in FIGS. 11 and 12, when the corner 2A of the enclosure body 2 is formed thick, a recess 61 is formed in the thick corner 2A, and the recess 61 facing the cover 3 is formed. The sealed container 62 may be formed by attaching the lid 23 to the opening. Here, when there is not enough space between the lid 23 and the cover 4 to diffuse the corrosive substance 25 and the particles 51, the guide groove 63 is provided in the corner 2A, and the flow from the recess 61 toward the magnetic disk 5 is performed. A road should be formed. In this case, the lid 23 of the hermetic container 62 is attached at a position substantially the same as or lower than the bottom of the guide groove 63.

  In this magnetic recording apparatus 1, the corrosive substance 25 and the particles 51 reach the magnetic disk 5 through the guide groove 63 from the hole formed in the lid 23. If there is a sufficient space between the lid 23 and the cover 4 for diffusing the corrosive substances 25 and the particles 51, the space can be used, so that the guide groove 63 is not necessary.

  Further, a sheet that seals the insertion hole 28 from the outside may be attached to the cover 3. This sheet is made of a material that cannot be penetrated by the needle 32 of the breaking device. When discarding the magnetic recording apparatus 1, the needle 32 is inserted after the sheet is peeled off. The sheet is preferably attached with an adhesive that cannot be re-stretched once peeled off. If the sheet is not peeled off, the magnetic recording apparatus 1 is not destroyed, so that the confirmation work at the time of work becomes easy.

  All examples and conditional expressions given here are intended to help the reader understand the inventions and concepts that have contributed to the promotion of technology, such examples and It should be construed without being limited to the conditions, and the organization of such examples in the specification is not related to showing the superiority or inferiority of the present invention. Although embodiments of the present invention have been described in detail, it should be understood that various changes, substitutions and variations can be made thereto without departing from the spirit and scope of the present invention.

1 Magnetic recording device 2 Enclosure body (case)
3 Cover (case)
4 Enclosure case 5 Magnetic disk (magnetic recording medium)
9 Magnetic head 21, 62 Airtight container (container)
23 Lid 25 Corrosive substance (destructive material)
31 Destruction device 32 Needle (opening member)
51 particles (destructive material)

Claims (5)

A magnetic recording medium;
A magnetic head for writing information to the magnetic recording medium and reading information from the magnetic recording medium;
A case for housing the magnetic recording medium and the magnetic head;
An accommodating portion that is disposed in the case and accommodates a destructive material that destroys the magnetic recording layer of the magnetic recording medium;
A magnetic recording apparatus comprising:   The magnetic recording apparatus according to claim 1, wherein the case is provided with an insertion hole into which an opening member that breaks a part of the housing portion can be inserted.   The magnetic recording apparatus according to claim 2, wherein the opening member is a needle.   The magnetic recording apparatus according to claim 1, wherein the destructive material is a corrosive substance that corrodes a magnetic recording layer of the magnetic recording medium.   The magnetic recording apparatus according to claim 1, wherein the destructive material is a particle having a diameter of 100 μm or less.

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