WO2007097391A1

WO2007097391A1 - Data erasing program, data erasing method and method for erasing magnetically recorded data

Info

Publication number: WO2007097391A1
Application number: PCT/JP2007/053264
Authority: WO
Inventors: Tomoaki Ito
Original assignee: Orient Instrument Computer Co., Ltd.
Priority date: 2006-02-23
Filing date: 2007-02-22
Publication date: 2007-08-30
Also published as: JPWO2007097391A1

Abstract

A data erasing program, a method for erasing magnetically recorded data and a data erasing method are provided for surely erasing all the magnetically recorded data in an unnecessary magnetic recording medium. A prescribed region (C) in the magnetic recording medium (1) is ensured not to be recognized in an operating system to be booted. In the case where there is magnetically recorded data in the prescribed area (C), the magnetically recorded data is erased. Area recognition data, which prescribes an area to be recognized by a specific operating system, in the contents recorded in the recording medium is erased or rewritten, then, the data recorded in the recording medium is erased.

Description

Specification

Data erasing program, data erasing method, and magnetic recording data erasing method

[0001] The present invention relates to a method of erasing recorded data recorded on a recording medium such as a fixed disk. The present invention also relates to a program for erasing recorded data recorded on a recording medium.

Background art

[0002] With recent advances in computer-related technology, the capacity of fixed disks (node disks) has increased, and not only for special applications by large corporations and research institutions such as universities, but also in ordinary households. Computers equipped with large-capacity fixed disks are now being used.

Fixed disks are becoming increasingly large-capacity and users are more likely to buy new, larger-capacity fixed disks and dispose of existing fixed disks that are no longer needed in just a few years. Natsuta.

[0003] When disposing of a fixed disk that is no longer needed, great care must be taken to prevent leakage of confidential information, and the ability to erase recorded magnetic recording data or recorded magnetic recording data Must be unreadable.

In order to avoid leakage of information from a fixed disk that is no longer needed, there is a method of physically destroying the fixed disk. However, this method cannot be used to recycle a fixed disk that has no functional problem, and is not preferable from the viewpoint of effective use of resources. Therefore, it is conceivable to erase the magnetic recording data recorded on the fixed disk by overwriting it with dummy data. Such a technique is disclosed in Patent Document 1, for example.

Patent Document 1: Japanese Unexamined Patent Publication No. 2006-53721

Disclosure of the invention

Problems to be solved by the invention

[0005] By the way, in recent years, as the fixed disk has increased in capacity, In the area, many computers were sold with data necessary for recovery recorded and the attachment of the recovery disc was omitted. That is, only a certain predetermined area of the entire fixed disk area cannot be recognized by the operating system, and therefore the user can recognize the range of the entire fixed disk area that can be recognized by the operating system. Will use a fixed disk. For example, if the capacity of the entire area is 100 GB (gigabytes) and 10 GB of that is the above-mentioned predetermined area, the remaining 90 GB is an area that can be recognized by the operating system. In addition, the operating system may make it unrecognizable for purposes other than recovery.

[0006] When there is a predetermined area that cannot be recognized by the operating system on the fixed disk as described above, the predetermined area portion can be used in various ways by computer manufacturers.

As an example, a copy of magnetic recording data recorded in an area recognizable by the user (operating system) is recorded in a predetermined area that cannot be recognized by the user. It can be used as a knock-up area. By creating this backup area, a computer manufacturer can provide a service for restoring important data that has been inadvertently deleted by the user.

[0008] As a user, since the important data that has been deleted is restored, this is a very difficult service, but when transferring this computer to another person or replacing the fixed disk The confidential data also remains in the aforementioned knock-up area. Moreover, since the user cannot recognize this backup area, even if deletion is attempted using the deletion program, the deletion program only deletes the recorded data in the area that can be recognized by the operating system. This leaves sensitive data.

Accordingly, an object of the present invention is to provide a data erasing method and a data erasing program that can surely erase all the recorded data recorded on a recording medium that is no longer needed.

Means for solving the problem

[0010] The present invention for solving the above-described problems is a force that defines a specific area in the entire area of the recording medium as an area that can be recognized by the booted operating system. An area recognition and erasure program that erases or rewrites area recognition data that prescribes that a specific area of the medium cannot be recognized by the booted operating system, and a data erasure program that erases or rewrites the recording data on the recording medium Data erasure program.

[0011] When the data erasing program of the present invention is used, the area recognition data that defines the area that can be recognized by the booted operating system is erased or rewritten by the area recognition erasure program. This expands the area that the operating system can recognize. Or the area is reduced if the operating system cannot recognize it. As a result, the above-described backup area can be recognized, and data can be erased or overwritten by the data erasure program.

Recording media include all fixed disks, semiconductor memories such as USB memory and various memory cards, regardless of interfaces such as IDE, SATA, SCSI, and USB.

[0012] The present invention is a data erasure program characterized in that the area recognition / erasure program erases or rewrites an area including the area where the area recognition data of the recording medium is stored and exceeding the area.

[0013] The data erasing program of the present invention erases or rewrites the area in which the area recognition data is stored wider, and can be more complete.

[0014] The present invention is a data erasure program characterized in that the area recognition and erasure function rewrites the area recognition program so that the entire area of the recording medium can be recognized.

[0015] According to the present invention, the area recognition and erasure function rewrites the area recognition program so that the entire area of the recording medium can be recognized, so that the data in the entire area of the recording medium can be erased or overwritten. Monkey.

[0016] The present invention is a method of erasing data recorded on a recording medium, and does not allow a specific operating system to recognize or recognize! This is a data erasing method characterized by erasing or rewriting area recognition data that defines the / ヽ area, and then erasing or rewriting data recorded on the recording medium.

[0017] In the data erasing method of the present invention, a specific operation is recorded among the contents recorded on the recording medium. Do not let the recognition system recognize or recognize it! / Delete or rewrite the area recognition data that defines the area. As a result, the area that the operating system can recognize increases. Or the area disappears or decreases if the operating system cannot recognize it.

In the present invention, data recorded on the recording medium is erased thereafter. Therefore, the data in the backup area is also erased or overwritten.

[0018] In the present invention, the predetermined area of the magnetic recording medium is secured unrecognizable by the operating system to be booted, and when the magnetic recording data is recorded in the predetermined area V, The magnetic recording data was erased.

By implementing the present invention, it is possible to erase data recorded in the area which is not recognized by the booted operating system, and it is possible to prevent leakage of confidential data.

In the present invention, when data is recorded in the normal area that can be recognized by the booted operating system, the data in the normal area is deleted when the data is also recorded in the predetermined area. When the present invention is performed so that the data in the predetermined area is also erased at the time, the magnetic recording data recorded in the normal area that can be recognized by the booted operating system and the boot operating system cannot recognize the data. It is possible to erase the magnetic recording data recorded in the possible predetermined area.

[0020] The present invention relates to a method for erasing data recorded on a recording medium, and the target recording medium includes area recognition data in addition to normal data, and the area recognition data is stored in the recording medium. Specifies that a specific area of the entire area is an area that can be recognized by the booted operating system, or that a specific area of the recording medium is an area that cannot be recognized by the booted operating system. A data erasing method characterized by erasing or rewriting area recognition data after erasing or rewriting normal data over a data erasing method.

[0021] The present invention also erases data on a recording medium having area recognition data. However, as an exception, normal data is erased or overwritten first, and then area recognition data is erased. Or the structure which rewrites is employ | adopted.

[0022] As described above, a copy of magnetic recording data recorded in an area that can be recognized by the user is overwritten by using a computer that has a function of backing up to an area that cannot be recognized by the user. Then, the data is automatically backed up in an unrecognizable area. Therefore, if the area that can be recognized by overwriting is overwritten with unknown data, this data is also expected to be backed up. For this reason, when data is overwritten repeatedly, all areas that are finally unrecognizable are overwritten with meaningless data.

The present invention is applicable when such a situation is assumed, and erases or rewrites area recognition data after erasing or rewriting normal data. As a result, the area recognition data disappears or becomes new, and the recording medium can be reused with the data erased.

[0023] In the present invention, after the area recognition erasing program erases or rewrites the area recognition data, the area where the BIOS recognition is unstable is deleted by the command of the recording medium interface.

Here, the BIOS is an abbreviation for a basic “input” and “output” system, and is a program that operates prior to starting the operating system when the computer is started.

When the present invention is carried out, the entire area of the recording medium can be deleted (released) and the system can be reconstructed thereafter without restarting (restarting) the computer as in the prior art. It becomes like this. Since it is not necessary to restart the computer, the working time is greatly shortened. In particular, when deleting data on a plurality of recording media, a huge amount of time can be saved.

[0026] Since the area recognition erase program erases the area recognition data or rewrites it, the area where B IOS recognition is unstable is deleted, so that the operating system cannot recognize it at first. The area can be recognized, so that the data in the entire area of the recording medium can be deleted.

In the invention of the data erasing method of the present invention, after the area recognition data is erased or rewritten After that, the area where BIOS recognition is unstable is deleted by the command of the interface of the recording medium.

When the recording medium is a fixed disk, there are IDE, SATA, IEEE1394, SCSI, USB, etc. as the fixed disk interface.

[0028] In the present invention, after the area recognition data is erased or rewritten, the area where the BIOS recognition is unstable is deleted by the command of the interface of the recording medium. It is possible to avoid the unstable operation of the computer. In other words, since the operation of the computer is stable and the operation can be continued without restarting, it is possible to quickly delete the data in the entire area of the recording medium.

The present invention is a data erasing program that records the capacity and model number of a recording medium in a log file after erasing data and deleting a region where BIOS recognition is unstable.

The present invention is also a data erasing method in which the capacity and model number of a recording medium are recorded in a log file after deleting or rewriting data and deleting a region where BIOS recognition is unstable.

[0030] In the present invention, after deleting data and deleting a region where BIOS recognition is unstable, the capacity and model number of the recording medium are recorded in the log file. As a result, it becomes possible to identify whether or not the data has been deleted for each recording medium.

The log file is preferably recorded on a removable recording medium such as a flexible disk.

The invention's effect

When the present invention is carried out, it becomes possible to erase all the recorded data on the recording medium including the recorded data recorded in the V area that is not recognized by the operating system used by the user.

Brief Description of Drawings

[0032] [Fig. L] (a) and (b) are both conceptual diagrams of a magnetic recording medium.

FIG. 2 is a conceptual diagram of a data erasing program according to the embodiment of the present invention.

[Fig.3] The data erase program shown in Fig.2 erases the data on the magnetic recording medium. It is a flowchart which shows a procedure.

FIG. 4 is a flowchart showing a modification of the procedure for erasing data on the magnetic recording medium by the data erasing program shown in FIG.

BEST MODE FOR CARRYING OUT THE INVENTION

[0033] Embodiments of the present invention will be further described below.

FIG. 1 (a) and FIG. 1 (b) are both conceptual diagrams of magnetic recording media. FIG. 2 is a conceptual diagram of a data erasing program according to the embodiment of the present invention. FIG. 3 is a flowchart showing a procedure for erasing data on the magnetic recording medium by the data erasing program shown in FIG.

A fixed disk 1 (recording medium) installed in a computer will be described with reference to FIG.

[0035] The magnetic recording medium is not only the fixed disk 1 (node, disk)! / ヽ (There are other flash memory and memory card) Force Fixed disk 1 is a computer with an operating system (basic software) installed In this example, the fixed disk 1 is used as an example because it is deeply involved in the activation of the disk and is ideal for recording large amounts of data.

As is well known, the first sector X of the fixed disk 1 has a master boot record. In this master boot record, a program related to booting a computer called a boot loader and a partition table are recorded. In addition, the area recognition data that prescribes the area that can be recognized by the booted operating system is stored in sector X and its vicinity.

The area recognition data defines a specific area (a predetermined area C described later) as an area that cannot be recognized by the operating system.

[0037] The partition table records the start position and end position of the partition. The usable area (normal area B) of the fixed disk 1 is determined by the start position and end position of the partition recorded in the partition table. In the partition table, the start position and end position of the partition are recorded so that an area having the capacity as specified by the computer on which the fixed disk 1 is mounted is secured. [0038] Further, an area recognizable by the operating system is defined by the partition table and area recognition data.

For example, in the fixed disk 1 shown in FIG. 1 (a), the normal area B that can be recognized by the booted operating system (basic software) is secured for the entire area A (full capacity). The remaining predetermined area C cannot be recognized by the operating system.

The capacity of the area D in the predetermined area C is the same as or smaller than the capacity of the normal area B. In addition to the region D, the region E exists in the predetermined region C. In the example shown in Fig. 1 (a), the normal area B of the fixed disk 1 is one partition. In this normal area B, an operating system and application programs and data (magnetic recording data) created by the user are stored. The area E is an area where other data (for example, data necessary for computer recovery) is stored.

On the other hand, in the fixed disk 1 shown in FIG. 1 (b), the normal area B is further divided into areas bl, b2, and b3. Of these, the area bl is an area for storing the operating system and application programs, and the areas b2 and b3 are areas reserved for storing data (magnetic recording data) created by the user. As described above, the normal area B can be arbitrarily divided into a plurality of areas as necessary. Along with this, region D is also divided into three regions (regions dl, d2, and d3). The data recorded in the areas b 1, b 2 and b 3 in the normal area B are recorded (backed up) in the areas dl, d 2 and d 3 in the area D, respectively. Here, the data recorded in the areas bl, b2, and b3 in the normal area B can be backed up by the compressed archive file. In that case, it is not necessary to divide region D into regions dl, d2, and d3. In the example shown in Fig. 1 (b), the depiction of sector X is omitted.

Next, the data erasing program of this embodiment will be described. The data erasure program of this embodiment includes an area recognition erasure program in addition to a normal data erasure program (referred to as a data erasure program in order to avoid confusion). The area recognition erase program erases or rewrites the area recognition data. Here, “rewrite” has no meaning, and includes both the case of overwriting with data (dummy data) and virtually erasing, and the case of changing or canceling the area recognition setting. In the data erasure program of this embodiment, the area recognition erasure program is executed prior to the execution of the data erasure program.

Specifically, the data erasure program of the present embodiment is executed according to the flowchart of FIG.

First, in step 1, the computer with the power turned off is booted with a bootable drive power other than the fixed disk 1 such as a CD-ROM drive or flexible drive, and the area recognition / deletion program recorded on the recording medium of the startup drive. Start up. In other words, the area recognition and erasure program is recorded in advance on a recording medium such as a removable disk (a CD-ROM or a flexible disk such as a flexible disk), and this recording medium is loaded into the startup drive when the computer is started. Is done. Furthermore, it is preferable that this activation driver is also automatically activated by the area recognition and erasure program batch processing when the computer is activated. If there is a bootable fixed disk other than fixed disk 1, that fixed disk force may be activated.

[0043] Starting Drive Force When the computer is started, in step 2, an area recognition / erasing program is executed, and an erasing operation on the fixed disk 1 is started. First, the area recognition erase program erases or rewrites the area recognition data recorded in sector X of fixed disk 1 using the computer's BIOS command. This makes it possible to recognize the powerful area C that cannot be recognized by the operating system.

[0044] Thereafter, the area recognition and erasure program deletes area C of fixed disk 1 using the ATA command that controls fixed disk 1, and the data recorded on fixed disk 1 is completely stored in step 3. Will be erased. Here, of the predetermined area C of the fixed disk 1, areas where BIOS recognition is unstable (areas near the end position of normal area B, areas near the start position of predetermined area C, etc.) are deleted with the ATA command. The

[0045] By performing such a procedure, the area where the BIOS recognition is unstable is deleted, and the computer can recognize the entire area A of the fixed disk 1 without turning on the power again. become. For example, out of the total area A of the fixed disk 1 with a capacity of 100 GB, the predetermined area C (for example, capacity 10 GB) cannot be recognized by the operating system, and only the capacity B of area B is recognized 90 bytes. Depending on the predetermined area The partition that separates the capacity of 10GB and the capacity of normal area B into 90GB is removed, and the capacity of 100GB in all areas A can be recognized.

[0046] Here, the ATA command is different for each fixed disk interface. The BIOS command is basically unrelated to the fixed disk interface. Even if a new interface is introduced in the future, the BIOS command Thus, it is effective to erase or rewrite the area recognition data on the fixed disk 1.

As a result, the area recognition data is erased or overwritten. More specifically, the contents of the first sector X of fixed disk 1 are erased or overwritten. As a precaution, the area including sector X may be erased.

[0048] In this embodiment, the data erasure program is subsequently started and the contents of the program are executed. As a result, data in all areas A (full capacity) of the fixed disk 1 is erased or overwritten. Therefore, the data recorded in area C (area D, area E) is also erased or overwritten, and the original data is lost.

After erasure, the capacity, model number, etc. are recorded in the log file, and this log file is saved on a removable disk such as a flexible disk, leaving a record in which the data in the entire area is erased. Of course, if a fixed disk other than the fixed disk 1 to be deleted is connected to the computer, the log file may be recorded on a fixed disk that is not to be deleted. This makes it possible to identify whether or not the data has been deleted for each recording medium (fixed disk 1).

[0050] In the data erasure program adopted in the above-described embodiment, the area recognition erasure program erases or overwrites the area recognition data. However, when overwriting, the area E (records data necessary for the recovery valid). Only the area that is not recognized by the operating system. That is, in this case, the data recorded in the area other than the area E out of the entire area A is the object to be erased.

[0051] In principle, the data erasure program shown in FIG. 2 first causes the area recognition erasure program to function and then the data erasure program to function. However, the program may function in the reverse order.

Fig. 4 shows that data on the magnetic recording medium is erased by the data erasure program shown in Fig. 2. It is a flowchart which shows the modification of the procedure to be performed.

[0052] That is, in a computer having a function of backing up data in an area that cannot be recognized by the user (operating system), when data overwriting is repeated, this data is also backed up and finally recognized. All possible areas will be overwritten with unknown data.

Therefore, if the dummy data is repeatedly overwritten as in the flowchart shown in FIG. 4, it is considered that the data in the substantially unrecognizable area is overwritten and erased by the dummy data.

The present embodiment can be applied when such a situation is assumed, and the area recognition data is erased or rewritten after repeatedly overwriting normal data with dummy data. As a result, the area recognition data disappears or becomes new, and the recording medium can be reused.

Note that the present invention does not limit the number of overwritings to a plurality of times, and the number of overwritings may be one.

In addition, the present invention overwrites dummy data indiscriminately at all addresses of the recording medium irrespective of the presence or absence of the data file, rather than overwriting the data recorded on the recording medium as a target. Therefore, when implementing the present invention, it is not necessary to recognize the data file itself recorded on the recording medium. Therefore, all of the recording media related to the file system (NTFS, FAT32, etc.) adopted by the operating system are used. With the area recognized, dummy data (low-level data) can be recorded in all areas and the original data can be erased.

Claims

The scope of the claims

[1] A specific area in the entire area of the recording medium is defined as an area that can be recognized by the booted operating system, or a specific area of the recording medium is an area that cannot be recognized by the booted operating system. A data erasure program comprising an area recognition erasure program for erasing or rewriting area recognition data defined as being present, and a data erasure program for erasing or rewriting data recorded on the recording medium

[2] The data erasing program according to claim 1, wherein the area recognizing / erasing program erases or rewrites an area including the area where the area recognizing data of the recording medium is stored and exceeding the area.

[3] The data erasing program according to claim 1 or 2, wherein the area recognizing / erasing program rewrites the area recognizing data so that the entire area of the recording medium can be recognized.

[4] This is a method for erasing data recorded on a recording medium, which should not be recognized or recognized by a specific operating system! / A data erasing method characterized by erasing or rewriting the area recognition data that defines the area, and then erasing or rewriting the data recorded on the recording medium.

[5] The magnetic recording data is erased when the predetermined area of the magnetic recording medium is secured so that it cannot be recognized by the booted operating system, and the magnetic recording data is recorded in the predetermined area. A method for erasing magnetic recording data.

[6] When data is recorded in the normal area that can be recognized by the operating system to be booted and the data is also recorded in the predetermined area, the predetermined area is deleted when the data in the normal area is deleted. 6. The method for erasing magnetic recording data according to claim 5, wherein the data in the area is also erased.

[7] A method for erasing data recorded on a recording medium, wherein the target recording medium is provided with area recognition data in addition to normal data, and the area recognition data is specified in all areas of the recording medium. A data erasing method that defines an area as an area that can be recognized by the operating system to be booted or a specific area of the recording medium that cannot be recognized by the operating system to be booted.て, normal A data erasing method comprising erasing or rewriting area recognition data after erasing or rewriting data.

[8] The area where the BIO recognition is unstable is deleted by a command of the interface of the recording medium after the area recognition erase program erases or rewrites the area recognition data. 4. The data erasing program according to any one of items 3 to 3.

[9] The method according to claim 7, wherein after the area recognition data is erased or rewritten, the area where the BIOS recognition is unstable is deleted by a command of the interface of the recording medium. .

[10] The data erasure program according to claim 8, wherein after the data is erased and the area where BIOS recognition is unstable is deleted, the capacity and model number of the recording medium are recorded in the log file.

[11] The data erasing method according to claim 9, wherein the capacity and model number of the recording medium are recorded in the log file after erasing or rewriting the data and deleting an unstable BIOS recognition area. .