JP2009211621A - Storage device with data complete deleting function, and method and program for the same - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To delete data in a single storage device without using an external deleting device. <P>SOLUTION: A data deleting device in the storage device for storing data has a switch part that receives instructions for data deletion and a data deleting method. When the received data deleting method is a logical data deleting method, data is deleted by writing the data in a storage medium. When the received data deleting method is a physical data deleting method, data is deleted by physically damaging the storage medium. <P>COPYRIGHT: (C)2009,JPO&INPIT

Description

  The present invention relates to data erasure of a storage device.

  In recent years, with the enforcement of the Personal Information Protection Law, the importance of various types of information data including personal information and confidential information within a company is increasing. From the viewpoint of leakage of these data, it has been regarded as important to securely erase data when discarding or recycling storage devices such as disk devices.

In view of the above-described background, a disk device having a data erasing function has been proposed (see, for example, Patent Document 1).
The disk device described in Patent Document 1 is provided with a dedicated interface for causing the disk device to erase data. Then, in response to a command from a maintenance tool provided in the host, the dedicated interface operates to execute data erasure. As a result, there is an effect that it is not necessary to perform all data erasure processing by the host system.
JP 2007-265492 A

  In the data erasing method as described above, there is a method of erasing from the outside using a software or BIOS connected to a PC or the like. However, when erasing is performed after removing a disk device or using a disk array device that needs to erase a large amount of disk devices, it takes time for equipment preparation and erasure. Further, the disk device used in the disk array device needs to be erased alone, and a separate erasing device is necessary.

  For example, the disk device described in Patent Document 1 described above performs data erasure in response to an external command, and the disk device alone cannot perform data erasure. In other words, it is a technique for erasing data during operation, and is not a technique for erasing data when the disk device is discarded or recycled.

  Further, the disk device described in Patent Document 1 described above employs a logical erasing method such as data overwriting, and the disk device cannot be physically destroyed. Therefore, there is a possibility that data is restored by special software. If the disk device is to be recycled, the function of physically destroying the disk device is not necessary. However, when the disk device is discarded, it is preferable to have a function of physically destroying the disk device.

  Therefore, an object of the present invention is to provide a storage device with a complete data erasure function, a method thereof, and a program thereof that can erase data by a single storage device without using an external erasing device.

  According to a first aspect of the present invention, there is provided a data erasing device in a storage device that stores data as a device, a switch unit that receives an instruction to erase data and a method for erasing data, and erasing the received data If the method is a logical data erasing method, logical data erasing means for erasing data by writing data to a storage medium, and a method for erasing the received data is a physical data erasing method There is provided a data erasing apparatus comprising physical data erasing means for erasing data by physically damaging a storage medium.

  According to a second aspect of the present invention, there is provided a data erasing method in a storage device for storing data as a method, wherein the switch unit accepts an instruction to erase data and a method for erasing data; When the data erasing method is a logical data erasing method, the physical data erasing method includes a logical data erasing step for erasing data by writing data to a storage medium, and a method for erasing the received data. In some cases, there is provided a data erasing method comprising a physical data erasing step of erasing data by physically damaging a storage medium.

  According to a third aspect of the present invention, there is provided a data erasing program for causing a computer to function as a data erasing device in a storage device that stores data as a program, and accepting an instruction to erase data and a method for erasing data When the switch unit and the method of erasing the received data are logical data erasing methods, logical data erasing means for erasing data by writing data to a storage medium, and a method of erasing the received data Is a physical data erasing method, physical data erasing means for erasing data by physically damaging the storage medium, and data for causing a computer to function as a data erasing device An erase program is provided.

  According to the present invention, it is possible to erase data by a single storage device without using an external erasing device.

  Next, embodiments of the present invention will be described with reference to the drawings.

  First, the outline of the features of the present invention will be described below.

  The present invention is characterized in that in a disk device, data is completely erased as a function of the device alone.

  When the switch is turned on, the disk recording medium is automatically destroyed by the erasing method by overwriting all the data a plurality of times or by the medium damaged head.

  In addition, after the erasure is completed, the disk device itself is locked so as to be inaccessible and cannot be reused except for release at the production factory, and thus functions as proof of data erasure.

  Next, the configuration of the embodiment of the present invention will be described in detail with reference to the drawings.

  Referring to FIG. 1, this configuration includes an erase switch 1, a disk FW (Firmware) 2, a read / write control unit 3, a medium breakage head control unit 4, a device lock control unit 5, a head 6, and a recording medium 7. Have

  Further, the head 6 includes a read / write head 61 and a medium breakage head 62, and the medium breakage head 62 is not operated and is retracted during normal disk drive operation. In the drawing, only the head 6 is shown, and the read / write head 61 and the medium breakage head 62 are not shown.

  Further, the disk FW2 has a full-write program 8 and a medium breakage head operation program 9.

  These operate as follows.

  The erasure switch 1 is a switch such as a toggle switch and instructs the start of erasure.

  The disk FW2 is loaded with a program for controlling and managing erasure according to the erasing method.

  The Read / Write control unit 3 performs Read / Write control of the Read / Write head 61 in accordance with an instruction from the disk FW2.

  The medium breakage head control unit 4 controls the medium breakage head 61 in accordance with an instruction from the disk FW2.

  The device lock control unit 5 disables access to the device and locks the erasure switch 1.

  The read / write head 61 is a head that reads and writes data during normal disk drive operation and data erasure. The medium breakage head 62 is a head that physically breaks the recording medium. As a result, the storage medium becomes unusable thereafter.

  The recording medium 7 is a medium in which data is stored. For example, if the disk device is a hard disk drive, the recording medium 7 is a disk (platter) part.

  The entire write program 8 is a program for operating the read / write head 61 so as to perform writing on the entire surface of the recording medium and logical data erasure.

  Logical data erasure can be performed by any method. An arbitrary writing pattern and the number of writings may be set, or may be set by a method based on a method such as the US National Security Agency recommended method (NSA). For example, 1, 0 or a random value may be overwritten once in all sectors. All sectors in the area specified in conformity with the NSA method may be overwritten twice with a random value and once with 00. In accordance with the US Department of Defense (DoD), all sectors in the specified area may be overwritten and verified twice with a specified value and once with a random value. The North Atlantic Treaty Organization (NATO) method or the Gutmann method may be adopted.

  The medium breakage head operation program 9 instructs the medium breakage head 61 to physically break the recording medium.

[Description of operation]
Next, the operation of the embodiment of the present invention will be described in detail with reference to the flowcharts of FIGS.

  When erasing the disk, the erasure switch 1 is turned on (step S101). The erasure switch can be selected by a write / erase method for multiple times and a medium damage erasure method.

  After the switch is turned on, the disk FW2 determines the erasing method and instructs each control unit to perform processing (step S102).

  If the write / erase method has been set for a plurality of times, the entire write program 8 is started from the disk FW2, and the write is performed to the recording medium via the read / write control unit 3 for erasure (step S103). As the erasing method, any method can be used as described above.

  When the medium breakage erasing method is set, the medium breakage head operation program 9 is started from the disk FW2, and the medium breakage head 62 is operated to break the recording medium (step S104).

  When the erasure is completed, the disk FW2 issues a device lock instruction to the device lock control unit 5 (step S105).

  Upon receiving the device lock instruction, the device lock control unit 5 disables access to the device and locks the erasure switch 1 (step S106).

[Other embodiments of the invention]
The present invention can be applied not only to a disk device but also to a memory device.

  Referring to FIG. 2, the present embodiment is different from the above-described embodiment in that there is no head 6. In this embodiment, the medium breakage head control unit 4 and the medium breakage head operation program 9 are replaced with the medium breakage high voltage program 10 for generating a high voltage for the print medium and the recording medium 7 is broken by generating a high voltage. A medium breakage high voltage control unit 11 having a function of causing

  The operation of another embodiment of the present invention will be described in detail with reference to the flowcharts of FIGS.

  When erasing the disk, the erasure switch 1 is turned on (step S101). The erasure switch can be selected by a write / erase method for multiple times and a medium damage erasure method.

  After the switch is turned on, the disk FW2 determines the erasing method and instructs each control unit to perform processing (step S102).

  If the write / erase method has been set for a plurality of times, the full-write program 8 is started from the disk FW2, and the write is performed to the recording medium via the read / write control unit to perform erasure (step S103).

  When the medium breakage erasing method is set, a program for generating a high voltage from the disk FW2 is started to operate the medium breakage high voltage device 26 and break the recording medium (step S204).

  When the erasure is completed, the disk FW2 issues a device lock instruction to the device lock control unit 5 (step S105).

  Upon receiving the device lock instruction, the device lock control unit 5 disables access to the device and locks the erasure switch 1 (step S106).

  The embodiment of the present invention described above has the following effects.

  As a first effect, according to the present embodiment, since the erasure processing program is installed in the firmware (FW) in the disk device, the data can be erased by the disk device or the memory device alone without an external erasing device. Can be executed.

  As a second effect, since the access lock to the disk device or the memory device is applied, the current state can be maintained, so that data erasure confirmation is achieved.

  As a third effect, it is possible to select a logical data erasing method by overwriting data or a data erasing method by causing physical damage.

  The embodiment of the present invention is not limited to the above-described embodiment, and various modifications are possible as long as they belong to the scope of the technical idea of the present invention.

  The disk device and the memory device according to the embodiment of the present invention can be realized by hardware, software, or a combination thereof.

It is a figure showing the basic composition of the embodiment of the present invention. It is a flowchart which shows the basic operation | movement of embodiment of this invention. It is a figure showing the basic composition of other embodiments of the present invention. It is a flowchart which shows the basic operation | movement of other embodiment of this invention.

Explanation of symbols

1 Erase switch 2 Disk FW
3 Read / Write control unit 4 Medium breakage head control unit 5 Device lock control unit 6 Head 7 Recording medium 8 Whole write program 9 Medium breakage head operation program 10 Medium breakage high voltage program 11 Medium breakage high voltage control unit 11
61 Read / Write head 62 Media breakage head

Claims (15)

A data erasing device in a storage device for storing data,
A switch unit that accepts an instruction to erase data and a method to erase data;
When the received data erasing method is a logical data erasing method, logical data erasing means for erasing data by writing data to a storage medium;
When the received data erasing method is a physical data erasing method, physical data erasing means for erasing data by physically damaging the storage medium;
A data erasing apparatus comprising: The data erasing device according to claim 1,
The data erasure further comprising a lock means for prohibiting subsequent access and acceptance at the switch section when data is erased by either the logical data erasure means or the physical data erasure means. apparatus. The data erasing device according to claim 1 or 2,
The data erasing device, wherein the storage device is a disk device, and the physical data erasing means erases data by physically damaging the storage medium. The data erasing device according to claim 1 or 2,
The data erasing device, wherein the storage device is a memory device, and the physical data erasing means erases data by generating a high voltage in a storage medium. The data erasing device according to any one of claims 1 to 4,
A data erasing apparatus, wherein a data writing method in the logical data erasing means can be arbitrarily selected. A data erasing method in a storage device for storing data,
An accepting step for receiving an instruction to erase data and a method for erasing data by the switch unit;
When the method of erasing the received data is a logical data erasing method, a logical data erasing step of erasing data by writing data to a storage medium;
When the method of erasing the received data is a physical data erasing method, a physical data erasing step of erasing data by physically damaging the storage medium;
A data erasing method comprising: The data erasing method according to claim 6,
The data further comprising a lock step for prohibiting subsequent access and accepting step at the switch section when data is erased in either the logical data erasing step or the physical data erasing step. Erasing method. The data erasing method according to claim 6 or 7,
The data erasing method, wherein the storage device is a disk device, and the physical data erasing step erases data by physically damaging the storage medium. The data erasing method according to claim 6 or 7,
The data erasing method, wherein the storage device is a memory device, and the physical data erasing step erases data by generating a high voltage in a storage medium. A data erasing method according to any one of claims 6 to 9,
A data erasing method, wherein a data writing method in the logical data erasing step can be arbitrarily selected. A data erasing program for causing a computer to function as a data erasing device in a storage device for storing data,
A switch unit that accepts an instruction to erase data and a method to erase data;
When the received data erasing method is a logical data erasing method, logical data erasing means for erasing data by writing data to a storage medium;
When the received data erasing method is a physical data erasing method, physical data erasing means for erasing data by physically damaging the storage medium;
A data erasing program for causing a computer to function as a data erasing device. The data erasing program according to claim 11,
The data erasing device further includes a lock unit that prohibits subsequent access and acceptance by the switch unit when data is erased by either the logical data erasing unit or the physical data erasing unit. A data erasing program. A data erasing program according to claim 11 or 12,
The data erasing program, wherein the storage device is a disk device, and the physical data erasing means erases data by physically damaging the storage medium. A data erasing program according to claim 11 or 12,
A data erasing program, wherein the storage device is a memory device, and the physical data erasing means erases data by generating a high voltage in a storage medium. A data erasing program according to any one of claims 11 to 14,
A data erasing program, wherein a data writing method in the logical data erasing means can be arbitrarily selected.

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