JP2010140539A - Magnetic recording medium disposal device - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To perform data erasure and physical breakage of a magnetic recording medium in a short time, while reducing influence of a magnet for data erasure upon the configuration of other devices. <P>SOLUTION: A magnetic recording disposal device 10 includes a rotation retention mechanism 109, a magnet unit 111 and a destruction device. The rotation retention mechanism 109 retains a magnetic recording medium 121 in a rotatable manner. From the edge portion of the magnetic recording medium 121 retained by the rotation retention mechanism 109, the magnet unit 111 extends toward the center of rotation of the magnetic recording medium 121, and erases the data in the magnetic recording medium 121. The destruction device is disposed at a position apart from the magnet unit, and physically breaks the magnetic recording medium 121. <P>COPYRIGHT: (C)2010,JPO&INPIT

Description

  The present invention relates to a magnetic recording medium processing apparatus for erasing a recording on a magnetic recording medium and damaging the magnetic recording medium.

  When discarding a magnetic recording medium such as a magnetic tape, it is strongly required to completely erase information recorded on the magnetic recording medium and make the magnetic recording medium unreadable from the viewpoint of preventing information leakage. For this reason, when the magnetic recording medium is discarded, the recording of the magnetic recording medium is erased or the magnetic recording medium is physically destroyed by a strong magnetic field.

  Patent Document 1 describes that the magnetic tape is physically cut when the magnetic tape is discarded. In Patent Document 1, a magnetic tape wound in a spiral shape around a reel core of a magnetic tape is cut from the outermost peripheral portion toward the core using a push blade.

  Patent Document 2 discloses a data erasing apparatus that erases data recorded on a magnetic disk. The data erasing device described in Patent Document 2 has a magnetic field generating unit made of a permanent magnet. A permanent magnet, which is a magnetic field generating means, is arranged so as to sandwich a magnetic recording medium. The recording on the magnetic disk is erased by the magnetic field from the magnetic field generating means.

Patent Document 3 describes a device that performs data erasure by a magnetic field or an electromagnetic field and physical destruction of a data recording medium. The data recording medium processing apparatus described in Patent Document 3 includes a housing portion around which a coil that generates a strong magnetic field is wound, and a destruction pin that physically destroys the data recording medium. The data recording medium processing device erases the data on the data recording medium in a state where the data recording medium is accommodated in the accommodating portion, and pierces the data recording medium with the destruction pin.
JP 2006-159328 A JP 2001-331904 A JP 2006-147044 A

  From the viewpoint of preventing information leakage, it is often required to physically damage the magnetic recording medium at a plurality of locations. However, in the method described in Patent Document 1, when the magnetic tape is cut at a plurality of locations, it is necessary to manually change the positional relationship between the pressing blade and the magnetic tape, which takes time and increases the burden on the operator. There is a problem.

  In the data erasing apparatus described in Patent Document 2, the area where data is erased from the magnetic disk is limited to a range where the magnetic force of the permanent magnet reaches. Therefore, in order to erase the data on the entire magnetic disk, it is necessary to use a permanent magnet that covers the entire magnetic disk or to manually move the magnetic disk so that the entire magnetic disk is exposed to the permanent magnet.

  When a large permanent magnet that covers the entire magnetic disk is used, there is a problem in that the magnetic force of the permanent magnet affects other device configurations installed around the permanent magnet. Moreover, when moving a magnetic disk manually, there exists a subject that work takes time.

  The data recording medium processing apparatus described in Patent Document 3 has a storage unit that stores a data recording medium, and a coil (that is, an electromagnet) for generating a magnetic force is wound around the storage unit. Even in this case, there is a problem that the large electromagnet covering the entire data recording medium affects other device configurations.

  Since the magnets (including electromagnets) described in Patent Documents 2 and 3 have strong magnetism, it is difficult to dispose a device component having metal in the vicinity thereof.

  Further, as described in Patent Document 1 and Patent Document 3, when a magnetic recording medium is physically destroyed, a large amount of magnetic powder of the magnetic recording medium is scattered at the time of destruction. When the magnetic recording medium has a case, a large amount of case fragments are scattered. If such debris or magnetic powder accumulates on the device, the device may deteriorate. In particular, the magnetic powder is attracted to a magnet (including an electromagnet) for erasing data on the magnetic recording medium, so that the deterioration of the magnet is accelerated.

  An object of the present invention is to provide a magnetic recording medium processing apparatus that can solve at least one of the problems of the background art. An example of the object is to provide a magnetic recording medium processing apparatus capable of reducing the influence of a magnet used for data erasing on other apparatus configurations and erasing and physically damaging the magnetic recording medium in a short time. That is.

  In order to solve at least one of the above problems, a magnetic recording processing apparatus of the present invention includes a rotation holding mechanism, a magnet portion, and a breakage device. The rotation holding mechanism holds the magnetic recording medium rotatably. The magnet portion extends from the edge of the magnetic recording medium held by the rotation holding mechanism toward the rotation center of the magnetic recording medium, and erases data on the magnetic recording medium. The breakage device is provided at a position away from the magnet unit and physically breaks the magnetic recording medium.

  According to the present invention, it is possible to reduce the influence of a magnet used for data erasure on other device configurations and perform data erasure and physical damage on a magnetic recording medium in a short time.

  Embodiments of the present invention will be described below with reference to the drawings. The magnetic recording medium processing apparatus of the present invention erases the recording on the magnetic recording medium and physically damages the magnetic recording medium. An example of the magnetic recording medium is a magnetic tape.

  FIG. 1 is a block diagram showing the configuration of the magnetic recording medium processing apparatus of this embodiment. 2 is a schematic perspective view of the magnetic recording medium processing apparatus, and FIG. 3 is a schematic top view of the magnetic recording medium processing apparatus. In FIG. 2, the housing 130 that houses each device configuration is shown in perspective.

  The magnetic recording medium processing apparatus 10 according to the present embodiment is capable of rotating the magnetic recording medium 121, a damaging apparatus that physically damages the magnetic recording medium 121, a data erasing apparatus that erases the magnetic data of the magnetic recording medium 121, and the magnetic recording medium 121. And a rotation holding mechanism 109 for holding.

  As the data erasing device, a magnet unit 111 that applies a magnetic force larger than the coercive force of the magnetic recording medium 121 to the magnetic recording medium 121 can be used. The magnet unit 111 may be a permanent magnet or an electromagnet as long as the recording on the magnetic recording medium 121 can be erased.

  The breakage device is preferably a device that cuts the magnetic recording medium 121 and melts the cut portion. As a suitable example of such an apparatus, an ultrasonic cutter 101 is used in the present embodiment. By melting the cut portion of the magnetic recording medium 121, generation of magnetic powder in the magnetic recording medium 121 is suppressed. In addition, when the magnetic recording medium 121 has a case, scattering of pieces of the case is suppressed.

  The ultrasonic cutter 101 has a cutter that vibrates ultrasonically. This ultrasonic vibration improves the cutting ability of the cutter. Further, the cut portion of the magnetic recording medium 121 is melted by the frictional heat generated by the ultrasonic vibration of the ultrasonic cutter 101. When the ultrasonic cutter 101 is used, since only the cut portion is melted, the generation of gas is suppressed.

  The magnetic recording medium processing apparatus 10 preferably further includes an ultrasonic output control unit 102, a cutter moving mechanism 112, and a cutter position sensor 106. The ultrasonic output control unit 102 is a control circuit that controls the ultrasonic output of the ultrasonic cutter 101, and performs ultrasonic output control, ON / OFF control, and the like.

  The cutter moving mechanism 112 is a mechanism for moving the ultrasonic cutter 101. By moving the ultrasonic cutter 101 by the cutter moving mechanism 112, the magnetic recording medium 121 is cut.

  When the cutter position sensor 106 detects that the ultrasonic cutter 101 is in the initial position, the ultrasonic output control unit 102 stops the ultrasonic output. Thereby, when the ultrasonic cutter 101 is not used, it is possible to prevent the ultrasonic cutter 101 from vibrating ultrasonically.

  4A to 4C show examples of the ultrasonic cutter 101 and the cutter moving mechanism 112. FIG. The cutter moving mechanism 112 shown in FIG. 4 operates manually. The cutter moving mechanism 112 has a lever 122. When the lever 122 is tilted, the blade portion 123 of the ultrasonic cutter 101 jumps downward (see FIG. 4B). As a result, the blade portion 123 can come into contact with the magnetic recording medium 121. When the lever 122 is further tilted, the ultrasonic cutter 101 rotates around the fixing point 125 of the support portion 124 (see FIG. 4C). As a result, the blade 123 moves in the radial direction of the magnetic recording medium 121. In this way, the magnetic recording medium 121 can be cut.

  Conversely, when the lever 122 is raised, the blade portion 123 of the ultrasonic cutter 101 is retracted. When the lever 122 is further raised, the ultrasonic cutter 101 returns to the initial position (position shown in FIG. 4A).

  As described above, the manual cutter moving mechanism shown in FIG. 4 moves the ultrasonic cutter 101 using the force with which the operator lowers the lever. Of course, the cutter moving mechanism 112 may operate automatically.

  The cutter position sensor 106 is a sensor that detects the position of the ultrasonic cutter 101. In the present embodiment, the cutter position sensor 106 detects whether or not the ultrasonic cutter 101 is in the initial position. The cutter position sensor 106 can be configured by a micro switch, a photo sensor, a photo switch, or the like.

  The rotation holding mechanism 109 rotates the magnetic recording medium 121 by rotating while holding the magnetic recording medium 121. The rotation of the rotation holding mechanism 109 is controlled by the rotation control unit 110. As the rotation holding mechanism 109, a gear motor or a stepping motor with a magnetic recording medium positioning function can be used.

  In the present embodiment, the rotation holding mechanism 109 is configured to be movable from the inside to the outside of the magnetic recording medium processing apparatus 10 or from the outside to the inside. As a result, the magnetic recording medium 121 can be transported to the inside of the magnetic recording medium processing apparatus 10 or discharged from the inside of the magnetic recording medium processing apparatus 10. The rotation holding mechanism 109 is transported by the transport mechanism 107.

  The transport mechanism 107 according to the present embodiment transports the rotation holding mechanism 109, but the transport mechanism 107 may transport the magnetic recording medium 121 directly. In this case, the magnetic recording medium processing apparatus 10 has an opening for inserting the magnetic recording medium 121. The magnetic recording medium 121 loaded from the opening is directly conveyed by the conveyance mechanism 107 and is held by the rotation holding mechanism 109.

  In addition, the transport mechanism 107 has a transport control unit 108. The conveyance control unit 108 controls conveyance of the magnetic recording medium 121 or the rotation holding mechanism 109.

  The magnet unit 111 extends from the edge of the magnetic recording medium 121 held by the rotation holding mechanism 109 toward the rotation center of the magnetic recording medium 121. Specifically, the magnet unit 111 has a substantially “U” shape and is configured to sandwich a part of the magnetic recording medium 121. In addition, it is preferable that the width | variety of the rotation direction R of the rotation holding mechanism 109 of the magnet part 111 is narrow.

  Two opposing faces of the “U” shape have different magnetic poles. These two surfaces extend from the edge of the magnetic recording medium 121 held by the rotation holding mechanism 109 toward the rotation center of the magnetic recording medium 121. Magnets having a high magnetic flux density (for example, about 0.6 T (Tesla)) are disposed on the two opposing surfaces.

  The data on the magnetic recording medium 121 in the portion sandwiched between the magnet units 111 is erased by the magnetic field of the magnet unit 111. In the present embodiment, since the entire magnetic recording medium 121 passes through the magnet unit 111 due to the rotation of the magnetic recording medium 121, all data on the magnetic recording medium 121 can be erased. Since the rotation of the magnetic recording medium 121 is automatically performed, the burden on the operator is reduced and the work is completed in a short time.

  As described above, since the magnet unit 111 can be made smaller than the magnetic recording medium 121, the magnetic force of the magnet unit 111 is suppressed from affecting other device configurations. In particular, it is possible to install the ultrasonic cutter 101, the transport mechanism 107, and the like near the magnetic recording medium 121 and away from the position where the magnet unit 111 is provided. This also has the effect of reducing the size of the magnetic recording medium processing apparatus 10.

  In the present embodiment, as illustrated in FIG. 3, the ultrasonic cutter 101 is disposed at a position away from the magnet unit 111. Thereby, the magnetic recording medium 121 can be damaged while erasing the data on the magnetic recording medium 121, so that the operation is completed in a short time.

  A transport mechanism 107 that transports the rotation holding mechanism 109 is also disposed at a position away from the magnet unit 111. A rotation control unit 110 provided in the rotation holding mechanism 109 automatically positions the magnetic recording medium 121. This facilitates data erasure and cutting of the magnetic recording medium 121.

  The magnetic recording medium processing apparatus 10 includes a medium detection sensor 104, a medium position sensor 105, an operation switch 113, an operation mode display unit 114, a database 115, a memory unit 116, a CPU 117, and a power supply unit 118. It is preferable to have.

  The medium detection sensor 104 detects whether or not the magnetic recording medium 121 is normally held by the rotation holding mechanism 109. As the medium detection sensor 104, a micro switch, an optical sensor, an optical switch, or a combination thereof can be used.

  The medium position sensor 105 is used to measure the rotation angle when the magnetic recording medium 121 is rotated by the rotation holding mechanism 109. Specifically, the rotation holding mechanism 109 is provided with a flag for each fixed angle. The medium position sensor 105 is provided at a stationary position in the magnetic recording medium processing apparatus 10. By detecting the flag by the medium position sensor 105, the rotation angle of the rotation holding mechanism 109 is measured. Note that the medium position sensor 105 may be arranged in the rotation holding mechanism 109 and the flag may be arranged at a stationary position. As the medium position sensor 105, for example, a photo sensor can be used.

  The rotation control unit 110 rotates the rotation holding mechanism 109 by a certain angle immediately after the magnetic recording medium 121 is transported into the magnetic recording medium processing apparatus 10 or after cutting the magnetic recording medium 121.

  The operation switch 113 is used for selecting an operation mode of the magnetic recording medium processing apparatus 10 and for starting an operation in each operation mode. Examples of operation modes that the magnetic recording medium processing apparatus 10 can take include an ultrasonic output mode, a medium transport mode, a medium rotation mode, and an interrupt processing mode in case of abnormality. As the operation switch 113, for example, a push button can be used. The operation mode display unit 114 includes an LED, a liquid crystal display, and the like, and displays the current operation mode and operation result.

  The CPU 117 is a central processing unit composed of a microprocessor and the like. The CPU 117 includes an ultrasonic output control unit 102, a medium detection sensor 104, a medium position sensor 105, a cutter position sensor 106, a conveyance control unit 108, a rotation control unit 110, an operation switch 113, an operation mode display unit 114, a memory unit 116, and the like. Control based on information in the database 115. The memory unit 116 is a semiconductor storage device such as a RAM and a ROM that can be directly read and written by the CPU 117, and temporarily stores an operation mode, information from each component, and the like.

  The database 115 stores information on the operation mode of the magnetic recording medium processing apparatus 10 in association with it. Based on these pieces of information, the magnetic recording medium 121 is cut while erasing the recording on the magnetic recording medium 121.

  Examples of information stored in the database 115 include ON / OFF timing of ultrasonic output, operation timing and conveyance distance of the conveyance mechanism, operation timing and rotation angle of the rotation holding mechanism, interrupt processing when an abnormality occurs, etc. There is. Here, the abnormality means that the ultrasonic cutter is overloaded, the conveyance of the conveyance mechanism is not completed within a certain time, and the medium position sensor 105 detects nothing during the rotation holding mechanism 109 for a certain time. Do not do. When these abnormalities occur, it is preferable to stop the processing and output the fact to the operation mode display unit 114.

  The power supply unit 118 is a power supply or the like that converts AC input to DC, and supplies power to each module that requires power.

  Next, the operation of the magnetic recording medium processing apparatus 10 will be described in detail with reference to the flowchart of FIG. First, the magnetic recording medium 121 is set on the rotation holding mechanism 109 (step A1). Specifically, after the magnetic recording medium processing apparatus 10 is turned on, the magnetic recording medium 121 is set in the rotation holding mechanism 109 in the insertion port 103. In the present embodiment, the insertion port 103 is a doorway with a door, and is configured such that the rotation holding mechanism 109 is conveyed and the door is opened.

  Next, the magnetic recording medium 121 is transported inside the magnetic recording medium processing apparatus 10 (step A2). Specifically, when the medium detection sensor 104 detects that the magnetic recording medium 121 is set in the rotation holding mechanism 109, the rotation holding mechanism 109 is directed toward the inside of the magnetic recording medium processing apparatus 10 (as an example). 200 mm). In this way, the magnetic recording medium 121 is transported inside the magnetic recording medium processing apparatus 10. At this time, a part of the magnetic recording medium 121 is sandwiched between the magnet portions 111 (see FIGS. 2 and 3). When the magnetic recording medium 121 passes between the magnet units 111, the data on the magnetic recording medium 121 is erased by the magnetic force of the magnet unit 111.

  Next, when the processing is started after the desired operation mode is selected by the operation switch 113, the rotation holding mechanism 109 rotates by a certain angle based on the information stored in the database 115 (step A3). At this time, the rotation angle of the magnetic recording medium 121 is measured by the medium position sensor 105 detecting the flag a certain number of times. The rotation angle of the magnetic recording medium 121 immediately after the start of processing is 240 ° as an example.

  Next, the ultrasonic cutter 101 is moved (for example, 140 mm) using the cutter moving mechanism 112, and the magnetic recording medium 121 is cut. (Step A4). At this time, it is preferable to make a cut along a radial direction connecting the edge to the center of the magnetic recording medium 121.

  After cutting the magnetic recording medium 121, when the ultrasonic cutter 101 is returned to the initial position using the cutter moving mechanism 112, the cutter position sensor 106 detects that and the ultrasonic output of the ultrasonic cutter 101 is output. Stop.

  When the number of cuts in the magnetic recording medium 121 is one, the magnetic recording medium 121 is transported to the outside of the magnetic recording medium processing apparatus 10 and the process ends. If the number of cuts is one, the magnetic recording medium 121 is rotated 360 ° or more in step A3 in order to erase the entire data of the magnetic recording medium 121. When making multiple cuts, the following processing is performed continuously.

  First, the magnetic recording medium 121 is rotated again by a fixed angle (60 ° as an example) by the rotation holding mechanism 109 (step A3). At this time, the rotation angle is measured based on the number of times the medium position sensor 105 detects the flag.

  Next, the ultrasonic cutter 101 is operated to cut the magnetic recording medium 121 (step A4). Thereafter, the number of cuts in the magnetic recording medium 121 is counted, and it is determined whether or not the number has reached a predetermined value (step A5).

  When the predetermined number of cuts have been made, the magnetic recording medium 121 is conveyed to the outside of the magnetic recording medium processing apparatus 10 and the processing is terminated. Otherwise, step A3 and step A4 are repeated again.

  Since the magnetic recording medium processing apparatus of this embodiment can automate the processes from Steps A2 to A6, the processing time is reduced and the burden on the operator is drastically reduced. In order to increase the force for cutting the magnetic recording medium 121, the work for cutting the magnetic recording medium may be performed manually. In this case, the magnetic recording medium processing apparatus 10 notifies the worker of the timing for cutting.

  In the above series of processing, the magnetic recording medium 121 is controlled to rotate at least once. Thereby, all the recordings of the magnetic recording medium 121 can be erased by the magnet unit 111.

  According to this configuration, since the magnetic recording medium 121 can be cut while erasing data, even when a large amount of magnetic recording medium is discarded, processing can be easily performed in a short time. Further, since it is not necessary for the worker to touch the magnetic recording medium 121 until the processing is completed, the worker can work safely.

  Since the magnetic recording medium 121 from which data has been erased is cut, it is impossible to read data from the magnetic recording medium 121, and it is easy to determine whether the magnetic recording medium 121 has been completely erased. You can also

  Next, an example of how to cut into the magnetic recording medium 121 will be described. FIG. 6 shows an example of the cut portion of the magnetic recording medium 121.

  First, after rotating the magnetic recording medium 121 by 240 ° by the rotation holding mechanism 109, the magnetic recording medium 121 is cut. Thereafter, every time the magnetic recording medium 121 is rotated by 60 °, the magnetic recording medium 121 is cut. In this way, the magnetic recording medium 121 is cut four times in total. In this case, since the magnetic recording medium 121 rotates by a total of 420 °, all data on the magnetic recording medium 121 is erased.

  As described above, the magnetic recording medium 121 is formed with four cut portions 131 at 60 ° intervals. The notch 131 formed first rotates 180 ° with the subsequent rotation of the magnetic recording medium 121. In the present embodiment, as shown in FIG. 3, the angle in the rotation direction R from the position of the ultrasonic cutter 101 to the position of the magnet unit 111 is greater than 180 °. Therefore, the cut portion 131 of the magnetic recording medium 121 does not reach the position of the magnet portion 111. For this reason, it can suppress that the burr | flash produced in the notch part 131 adsorb | sucks to the magnet part 111. FIG.

  As in the above example, the rotation angle of the magnetic recording medium 121 is preferably controlled so that the ultrasonic cutter 101 does not reach the notch 131 of the magnetic recording medium 121 to the magnet 111. Thereby, it is possible to suppress the burrs generated when the magnetic recording medium 121 is cut from being attached to the magnet unit 111.

  The transport mechanism 107 is preferably arranged on the upstream side in the rotation direction R of the magnetic recording medium 121 with respect to the magnet unit 111 and on the downstream side in the rotation direction R with respect to the ultrasonic cutter 101. Thereby, the angle of the rotation direction between the magnetic recording medium 121 and the magnet part 111 becomes large. When this angle is large, a cut can be made over a wide area of the magnetic recording medium 121.

  It is preferable that the ultrasonic cutter 101 cuts into the magnetic recording medium 121 at four or more locations. That is, after rotating the magnetic recording medium 121 by a preset angle, the operation of cutting the magnetic recording medium 121 with the ultrasonic cutter 101 is performed four or more times. This is because, according to market demand, when the number of cut portions is less than three, it may be determined that it is insufficient from the viewpoint of preventing information leakage. Generally, at least two notch portions are required, but if the prevention of information leakage is sufficient, the notch portion may be one.

  In the above description, the ultrasonic cutter 101 represents “cutting the magnetic recording medium”, but the ultrasonic cutter 101 may cut the magnetic recording medium 121.

  Further, when processing the magnetic tape, the ultrasonic cutter 101 does not need to cut the hub portion until it touches the hub portion of the reel of the magnetic tape and completely cut the hub portion. In this case, it is possible to prevent the magnetic tape from being divided and falling off from the rotation holding mechanism 109.

  Although the preferred embodiments of the present invention have been presented and described in detail above, the present invention is not limited to the above-described embodiments, and it is understood that various changes and modifications can be made without departing from the gist. I want to be.

1 is a block diagram showing a configuration of a magnetic recording medium processing apparatus according to an embodiment. 1 is a schematic perspective view of a magnetic recording medium processing apparatus according to an embodiment. 1 is a schematic plan view of a magnetic recording medium processing apparatus according to an embodiment. (A)-(c) is schematic which shows an example of an ultrasonic cutter and a cutter moving mechanism. 6 is a flowchart showing an example of the operation of the magnetic recording medium processing apparatus. The top view which shows an example of the cut | notch part of a magnetic recording medium.

Explanation of symbols

DESCRIPTION OF SYMBOLS 10 Magnetic recording medium processing apparatus 101 Ultrasonic cutter 102 Ultrasonic output control part 103 Input port 104 Medium detection sensor 105 Medium position sensor 106 Cutter position sensor 107 Conveyance mechanism 108 Conveyance control part 109 Rotation holding mechanism 110 Rotation control part 111 Magnet part 112 Cutter moving mechanism 113 Operation switch 114 Operation mode display unit 115 Database 116 Memory unit 117 CPU
118 Power supply 121 Magnetic recording medium 122 Lever 123 Blade portion 124 Support portion 125 Fixed point 130 Case 131 Cut portion

Claims (9)

A rotation holding mechanism for holding the magnetic recording medium rotatably;
A magnet portion extending from an edge of the magnetic recording medium held by the rotation holding mechanism toward a rotation center of the magnetic recording medium, and erasing data of the magnetic recording medium;
A magnetic recording medium processing apparatus, comprising: a breakage device provided at a position away from the magnet portion and physically damaging the magnetic recording medium.   2. The magnetic recording medium processing apparatus according to claim 1, wherein the damaging device is a device that melts a cut portion while making a cut in the magnetic recording medium.   The magnetic recording medium processing apparatus according to claim 2, wherein the damage device is an ultrasonic cutter including a cutter that vibrates ultrasonically. A control unit for controlling the rotation of the rotation holding mechanism and the breaking operation of the breakage device;
4. The control unit according to claim 1, wherein the controller causes the magnetic recording medium to be damaged by the damage device after rotating the magnetic recording medium by a preset rotation angle. 5. Magnetic recording medium processing apparatus.   The magnetic recording medium processing apparatus according to claim 4, wherein the control unit causes the operation to be performed at least four times.   The magnetic recording medium processing device according to claim 4, wherein the control unit controls a rotation angle of the magnetic recording medium so that a portion damaged by the damage device does not reach the magnet unit.   The magnetic recording medium processing apparatus according to claim 1, further comprising a transport mechanism that transports the magnetic recording medium to a position where the magnet unit is provided.   The magnetic recording medium processing device according to claim 7, wherein the transport mechanism is disposed upstream of the magnet unit in a rotation direction of the magnetic recording medium and downstream of the damage device in the rotation direction. .   The magnet unit includes two opposing surfaces having different magnetic poles, and the two surfaces are directed from the edge of the magnetic recording medium held by the rotation holding mechanism toward the rotation center of the magnetic recording medium. The magnetic recording medium processing apparatus according to claim 1, wherein the magnetic recording medium processing apparatus extends.

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