JP2008059388A - Information processor and data erasing method of hard disk applied to information processor - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide an information processor which makes it possible to completely erase the data that have been stored in a hard disk with which an operating system that is operating. <P>SOLUTION: An HDD erasure utility 100 writes an image data 150 in a head section of a HDD13 and resets a system. In the inside of the image data 150, a master boot record which uses an OS151 for HDD erasure as a start OS exists, and the OS151 for the HDD erasure is started, after the system reset. A RAM disk creation module 152 is automatically executed by the OS151 for this HDD erasure, and a RAM disk is created on a main memory 12, Moreover, an HDD erasure implement module 153 in the image data 150 is copied to the RAM disk. Then, the HDD erasure implement module 153 copied to the RAM disk is executed automatically, and a data of the HDD13 is erased. <P>COPYRIGHT: (C)2008,JPO&INPIT

Description

  The present invention relates to a hard disk data erasing technique suitable for application to an information processing apparatus such as a personal computer.

  In recent years, interest in protection of information has increased, and various internal rules have been established for each company to prevent leakage of data in personal computers lent to business employees, not only outside the company but also outside the related department. As one typical example, there is a method in which data on a hard disk is always deleted when a rented personal computer is returned or when the personal computer is discarded.

  Also, hard disk data can be erased by using the formatting function of the operating system, since data may remain physically even if logically erased. For this reason, techniques such as destroying a hard disk or using a dedicated program for overwriting meaningless data over the entire hard disk are often used (see, for example, Patent Document 1).

Today, when recycling is regarded as important, the latter method is often used. According to this method, returned personal computers are lent to other departments, or discarded personal computers are handed over to third parties. At this time, even if the data on the hard disk is physically read out as a bit string, the meaningless data has already been overwritten, so that no information leakage occurs.
JP 2003-162450 A

  By the way, the conventional methods including the method described in Patent Document 1 are a floppy disk (registered trademark) or a compact disk storing a simple operating system (OS) having only a limited function and a data erasing program. It is common to have a mechanism in which a disk is stored in a slot, a simple OS is started using these as boot media, and a data erasure program is executed under this simple OS. The reason why the data erasure program is executed under the simple OS is that data on the hard disk in which the OS is stored cannot be completely erased during the operation of the OS that is normally used.

  Recently, however, many personal computers that do not have a floppy disk (registered trademark) or compact disk drive are also used, and it is not efficient to prepare an external drive only for this operation. In the first place, the work itself of starting up a simple OS for erasing data instead of the usual OS is troublesome. Therefore, for this type of personal computer, there is a mechanism that can completely erase data on the hard disk storing the operating OS without connecting an external drive or restarting the OS. It is strongly desired.

  The present invention has been made in consideration of such circumstances, and is applied to an information processing apparatus and an information processing apparatus capable of completely erasing data on a hard disk in which an operating operating system is stored. An object of the present invention is to provide a hard disk data erasing method.

  In order to achieve the above object, the information processing apparatus of the present invention creates a simple operating system that can be operated without using a hard disk after being loaded and started on the main memory, and a ram disk on the main memory. A ram disk creating program, a data erasing program for erasing data on the hard disk, a master boot record set so that the simplified operating system is activated, and the ram disk creating being read when the simplified operating system is activated Partition image data including a program and control data for automatically and sequentially executing the data erasing program under the simple operating system, the first sector of the hard disk storing the operating system in operation Image data writing means that writes data continuously continuously, and system reset means for resetting the system after writing the image data by the image data writing means, wherein the ram disk creation program stores the ram disk And setting the environment for operating the simple operating system and the programs under the simple operating system as the current disk, and creating the data erasing program in the image data written in the hard disk on the main memory It has the procedure which copies in the said ram disk.

  Further, the information processing apparatus of the present invention is a simple operating system that can be operated without using a hard disk after being loaded and started on the main memory, a ram disk creating program for creating a ram disk on the main memory, A data erasure program for erasing data on the hard disk, and control data that is read when the simplified operating system is started and that automatically executes the ram disk creating program and the data erasing program sequentially under the simplified operating system. Image data writing means for writing the image data of the partition into a free area of a hard disk in which the operating system in operation is stored, and in the image data written by the image data writing means The MBR rewriting means for rewriting the master boot record of the hard disk so that the simple operating system is started, and the OS restart for requesting the operating system to be restarted after rewriting the master boot record by the MBR rewriting means The ram disk creation program is configured to set up an environment for operating the simplified operating system and programs under the simplified operating system using the ram disk as a current disk and written to the hard disk. The data erasing program in the image data is copied to the ram disk created on the main memory.

  According to the present invention, it is possible to provide an information processing apparatus capable of completely erasing hard disk data in which an operating operating system is stored, and a hard disk data erasing method applied to the information processing apparatus.

  Embodiments of the present invention will be described below with reference to the drawings.

(First embodiment)
First, a first embodiment of the present invention will be described. FIG. 1 is a diagram schematically illustrating a system configuration of an information processing apparatus 1 according to the first embodiment. The information processing apparatus 1 is realized as a notebook type personal computer (PC), for example.

  As shown in FIG. 1, the information processing apparatus 1 includes a CPU 11, a main memory 12, a hard disk drive (HDD) 13, a display controller 14, a keyboard controller 15, a communication controller 16, and the like, which are connected via a system bus. Interconnected.

  The CPU 11 is a processor that controls the operation of the information processing apparatus 1 and executes various programs including an operating system and utilities loaded from the HDD 13 to the main memory 12.

  The main memory 12 is a high-speed and small-capacity memory device that is used as the main storage of the information processing apparatus 1, while the HDD 13 is a low-speed and large-capacity memory device that is used as an external storage for the information processing apparatus 1.

  The display controller 14 is a device responsible for the output side of the user interface provided by the information processing apparatus 1 and displays the display data created by the CPU 11 on a display device such as an LCD (liquid crystal display). On the other hand, the keyboard controller 15 is a device responsible for the input side of the user interface provided by the information processing apparatus 1, and quantifies the operation of the user, for example, a keyboard or a mouse, and transmits it to the CPU 11.

  The communication controller 16 executes and controls communication with other information processing apparatuses via a communication path such as a LAN (local area network). Here, it is assumed that the information processing apparatus 1 is loaned to an employee for business use. When returning, as shown in FIG. 2, the information processing apparatus 1 is connected to the in-house server 2 via the LAN and erases data in the HDD 13. It is assumed that a rule is set to download and execute the HDD erasure utility 100. The communication controller 16 controls execution of communication for this download.

  The HDD erasure utility 100 downloaded from the server 2 is activated under the operating operating system in the information processing apparatus 1. That is, the information processing apparatus 1 according to the present embodiment realizes erasure of data in the HDD 13 in which the operating system being operated is stored, and the method will be described in detail below.

  FIG. 3 is a diagram showing functional blocks of the HDD erasure utility 100. The HDD erasure utility 100 is configured as a program that can be loaded from the HDD 13 (download destination) into the main memory 12 and executed by the CPU 11.

  As shown in FIG. 3, the HDD erasure utility 100 includes a priority setting module 101, an erasure partition writing module 102, and a reset driver 103, and holds erasure partition image data 150. The erase partition image data 150 includes an HDD erase OS 151, a ram disk creation module 152, and an HDD erase execution module 153.

  The priority setting module 101 performs processing for setting the priority of the HDD erasure utility 100 to the highest value. The erase partition writing module 102 performs a process of writing the erase partition image data 150 physically continuously from the head sector of the HDD 13. Then, the reset driver 103 performs a process for resetting the information processing apparatus 1.

  A master boot record (MBR) is written in the head sector of the HDD 13, and the OS to be started is determined by this master boot record. There is also a master boot record in the erase partition image data 150 which is physically written continuously from the head sector of the HDD 13 by the erase partition writing module 102, and this master boot record is set so that the HDD erase OS 151 is started. Has been. Therefore, after the erase partition image data 150 is written by the erase partition writing module 102, when the system is reset by the reset driver 103, the HDD erase OS 151 is started.

  The erase partition image data 150 also includes control data for automatically and sequentially executing the ram disk creation module 152 and the HDD erase execution module 153 under the HDD erase OS 151 immediately after the startup of the HDD erase OS 151. . For example, in the case of MS-DOS (registered trademark) of Microsoft Corporation in the United States, a batch file named autoexec.bat corresponds.

  The HDD erasing OS 151 in the erasure partition image data 150 is a simplified OS having only basic functions that can be operated without using the HDD 13 after being loaded into the main memory 12 and activated. The ram disk creation module 152 creates a manageable area on the main memory 12 in the same manner as the HDD 13. This type of area created on the main memory 12 is called a ram disk. The ram disk creation module 152 also performs a process of changing the current disk of the HDD erasing OS 151 loaded from the HDD 13 to the main memory 12 and started, to a ram disk. This is an environment setting for causing the HDD erasing OS 151 and the programs under the HDD erasing OS 151 to operate on the ram disk. In this connection, the ram disk creation module 152 also performs a process of copying the HDD erasure execution module 153 in the erasure partition image data 150 (written to the HDD 13) to the ram disk. The HDD erasure execution module 153 erases data in the HDD 13.

  Here, with reference to FIG. 4 and FIG. 5, an operation principle of data erasure of the HDD 13 (in which an operating operating system is stored) by the HDD erasure utility 100 will be described.

  FIG. 4 is a conceptual diagram for explaining the processing flow of the HDD erasure utility 100 downloaded from the server 2 and started under the (ordinary) OS.

  The HDD erasure utility 100 first requests the OS to set the highest priority of itself by the priority setting module 101 (FIG. 4 (1)). This is to prevent the user's own process from being interrupted and interrupted by another process. RT-24 in the figure indicates the highest real-time class priority.

  Next, the erasure partition writing module 102 writes the erasure partition image data 150 to the head of the HDD 13 ((2) in FIG. 4). This writing is not a writing to a free area but an overwriting to an existing area in which a part of an operating OS module may be stored. The priority setting by the priority setting module 101 is a protection process for overwriting this existing area. If this is not performed and another process interrupts and an OS module destroyed by overwriting is used, the system of the information processing apparatus 1 will end abnormally.

  When the writing of the erase partition image data 150 is completed, the reset driver 103 causes the information processing apparatus 1 to perform a system reset ((3) in FIG. 4). The HDD erase utility 100 has its own reset driver 103 without using the restart means provided as standard with the OS. This is because the area required for the OS restart means to operate when the erase partition image data 150 is written. This is because it may be destroyed.

  FIG. 5 is a conceptual diagram for explaining the flow of processing in the information processing apparatus 1 after the system reset by the reset driver 103.

  As described above, when the system is reset after the erasure partition image data 150 is written, the HDD erasure OS 151 in the erasure partition image data 150 is activated (FIG. 5 (1)). Then, the HDD erasing OS 151 automatically executes the ram disk creation module 152 immediately after startup.

  The ram disk creation module 152 activated in this way creates a ram disk in the main memory 12 (FIG. 5 (2)), and copies the HDD erase execution module 153 in the erase partition image data 150 to the created ram disk. (FIG. 5 (3)). At this time, the ram disk creation module 152 also executes processing for setting the current disk as a ram disk.

  Following the ramdisk creation module 152, the HDD erasure OS 151 automatically executes the HDD erasure execution module 153 (FIG. 5 (4)). Since the current disk is a ram disk, the HDD erase execution module 153 on the ram disk as a copy is activated. The HDD erasure execution module 153 executes data erasure processing such as overwriting meaningless data over the entire HDD 13 (FIG. 5 (5)).

  As a result, a floppy disk (registered trademark) or a compact disk in which programs corresponding to the HDD erasing OS 151 and the HDD erasing execution module 153 are stored is prepared, or an external drive for accessing these media is prepared. The HDD 13 in which the operating OS is stored can be obtained simply by starting the HDD erasing utility 100 under the operating OS without requiring the operation of restarting the information processing apparatus 1 using these media as startup media. Data erasure is realized.

  6 and 7 are flowcharts showing an operation procedure related to data erasure of the HDD 13 of the information processing apparatus 1.

  First, the activated HDD erasure utility 100 sets its own priority to the highest (real-time class P1 = 24) by the priority setting module 101 (step A1 in FIG. 6), and the erase partition write module 102 erases the erase partition image. Data 150 is written to the head of the HDD 13 (step A2 in FIG. 6), and the system is reset by the reset driver 103 (step A3 in FIG. 6).

  Then, after the system reset, the HDD erasing OS 151 is activated (step B1 in FIG. 7), and the ram disk creating module 152 is automatically executed under the HDD erasing OS 151 to create a ram disk on the main memory 12 (FIG. 7). Step B2). Also, the ram disk creation module 152 copies the HDD erasure execution module 153 in the erasure partition image data 150 written in the HDD 13 to the ram disk (step B3 in FIG. 7).

  Subsequently, the HDD erasure OS 151 automatically executes the HDD erasure execution module 153 copied to the ramdisk (step B4 in FIG. 7), and the activated HDD erasure execution module 153 executes data erasure of the HDD 13 (FIG. 7). 7 Step B5).

  As described above, the information processing apparatus 1 according to the present embodiment can completely erase the data on the hard disk in which the operating system in operation is stored.

(Second Embodiment)
Next explained is the second embodiment of the invention. FIG. 8 is a functional block diagram of the HDD erasure utility 100 in the information processing apparatus 1 according to the second embodiment.

  As shown in FIG. 8, the HDD erase utility 100 of the second embodiment is replaced with the MBR rewrite module 104 and the OS instead of the priority setting module 101 and the reset driver 103 of the HDD erase utility 100 of the first embodiment. A restart module 105 is provided. Further, the erase partition writing module 102 of the second embodiment executes writing to a (continuous) free area of the HDD 13 instead of overwriting the erase partition image data 150 on the head of the HDD 13.

  When the erase partition writing module 102 writes the erase partition image data 150, it acquires the physical storage location in the HDD 13 from the OS, determines whether it is arranged in a continuous area, By rewriting the partition image data 150, the erase partition image data 150 is arranged in the continuous area.

  The MBR rewrite module 104 acquires the physical storage position in the HDD 13 in the erase partition image data 150 from the erase partition write module 102 so that the HDD erase OS 151 in the erase partition image data 150 becomes the boot OS. Rewrite the master boot record. The OS restart module 105 requests the OS to restart. Unlike the overwriting of the existing area in the first embodiment, in this second embodiment, the erasure partition image data 150 is written in the free area of the HDD 13, so there is no destruction of the OS at this point and the OS restarts. Works correctly.

  Also, since there is no destruction of the OS, even if other processing interrupts, the system of the information processing apparatus 1 will not end abnormally, so it is not essential to set its own priority to the highest level. . When the OS is restarted, the HDD erasing OS 151 in the erasure partition image data 150 is activated by rewriting MBR, and data erasure of the HDD 13 is executed in the same procedure as in the first embodiment.

  FIG. 9 is a conceptual diagram for explaining a processing flow of the HDD erasure utility 100 downloaded from the server 2 and started under the (normal) OS.

  The HDD erasure utility 100 first writes the erasure partition image data 150 to the continuous free space of the HDD 13 by the erasure partition writing module 102 (FIG. 9 (1)). Further, the MBR rewrite module 104 acquires the physical storage position of the partition image data 150 in the HDD 13 from the erase partition writing module 102 (acquiring the storage position for arrangement in the continuous area) ( 9 (2)), the master boot record is rewritten so that the HDD erasing OS 151 in the partition image data 150 is the boot OS (FIG. 9 (3)). When the rewriting of the master boot record is completed, the OS restart module 105 requests the OS to restart ((4) in FIG. 9).

  FIG. 10 is a conceptual diagram for explaining the flow of processing in the information processing apparatus 1 after the OS restart by the OS restart module 105.

  As described above, after the master boot record is rewritten so that the HDD erasing OS 151 in the erase partition image data 150 is the boot OS, when the OS is restarted, the erase partition image data 150 in the erase partition image data 150 is read according to the master boot record. The HDD erasing OS 151 is activated (FIG. 10 (1)).

  Hereinafter, as in the first embodiment, the HDD erasing OS 151 automatically executes the ram disk creation module 152 immediately after the startup, and the ram disk creation module 152 activated in this way is stored in the main memory 12. A ram disk is created (FIG. 10 (2)), and the HDD erase execution module 153 in the erase partition image data 150 is copied to the created ram disk (FIG. 10 (3)). At this time, the ram disk creation module 152 also executes processing for setting the current disk as a ram disk.

  Following the ramdisk creation module 152, the HDD erasure OS 151 automatically executes the HDD erasure execution module 153 (FIG. 10 (4)). Since the current disk is a ram disk, the HDD erase execution module 153 on the ram disk as a copy is activated. The HDD erasure execution module 153 executes a data erasure process in which, for example, meaningless data is overwritten on the entire HDD 13 (FIG. 10 (5)).

  FIG. 11 is a flowchart showing an operation procedure related to data erasure of the HDD 13 of the information processing apparatus 1.

  The HDD erasure utility 100 writes the erasure partition image data 150 into the empty area of the HDD 13 by the erasure partition writing module 102 (step C1 in FIG. 11). The erase partition writing module 102 obtains the physical storage position of the erase partition image data 150 in the HDD 13 from the OS and determines whether the erase partition image data 150 is arranged in the continuous area (step C2 and step C3 in FIG. 11). Is determined (NO in step C3 in FIG. 11), the writing of the erase partition image data 150 is executed again.

  When the erase partition image data 150 is arranged in the continuous area (YES in step C3 in FIG. 11), the MBR rewrite module 104 rewrites the master boot record so that the HDD erase OS 151 in the erase partition image data 150 is the boot OS ( Step C4 in FIG. 11), and the OS restart module 105 requests the OS to restart (Step C5 in FIG. 11).

  Then, the HDD erasing OS 151 is activated, and data erasure of the HDD 13 is executed in the same procedure as in the first embodiment shown in FIG.

  As described above, the information processing apparatus 1 according to the present embodiment can completely erase the data on the hard disk in which the operating system in operation is stored.

(Third embodiment)
Next explained is the third embodiment of the invention. FIG. 12 is a diagram schematically illustrating a system configuration of the information processing apparatus 1 according to the third embodiment. The information processing apparatus 1 according to the third embodiment is a so-called multiprocessor system having a plurality of CPUs 11 as shown in FIG. In the information processing apparatus 1 having such a configuration, there is no problem in erasing data in the HDD 13 using the HDD erasure utility 100 described in the second embodiment (since there is no possibility of destroying the OS), When erasing data in the HDD 13 using the HDD erasure utility 100 described in the first embodiment, even if the priority of the HDD erasure utility 100 is increased, the CPU 11 other than the CPU 11 that executes the HDD erasure utility 100 is used. If another process is executed, the OS module destroyed by this process may be used, and the system of the information processing apparatus 1 may be abnormally terminated.

  Therefore, the information processing apparatus 1 according to the third embodiment is a modification of the HDD erasure utility 100 described in the first embodiment so that it can be used without problems even in a multiprocessor system. FIG. 13 is a diagram showing functional blocks of the HDD erasure utility 100 of the third embodiment.

  As shown in FIG. 13, in the HDD erase utility 100 of the third embodiment, a CPU count acquisition module 106 and an occupied process activation module 107 are added to the HDD erase utility 100 of the first embodiment described above.

  The CPU number acquisition module 106 acquires the number of CPUs 11 installed in the information processing apparatus 1 from the OS. Then, the occupation process activation module 107 activates processes (programs) for occupying each CPU 11 by the number of CPUs 11 acquired by the CPU number acquisition module 106. Further, the priority setting module 101 sets the priority of the process activated by the exclusive process activation module 107 to a value higher than the value set in the HDD erasure utility 100.

  The process activated by the occupied process activation module 107 may be any process that can occupy the CPU 11 indefinitely, such as a simple loop process. It is only necessary to start the same program for the number of CPUs 11 (no need to prepare a plurality of programs).

  Since the relationship of the priority of the HDD erasing utility 100> the priority of the occupied process is established, the HDD erasing utility 100 being executed by any one of the CPUs 11 continues processing without being affected by the occupied process. In other words, one of the plurality of occupied processes is in an execution waiting state.

  In other words, by starting up this occupied process by the number of CPUs 11 with the second highest priority after the HDD erasing utility 100, other processing is prevented from being executed, and the OS module destroyed by overwriting the erasure partition image data 150 is deleted. It prevents it from being used.

  FIG. 14 is a conceptual diagram for explaining a processing flow of the HDD erasure utility 100 downloaded from the server 2 and started under the (ordinary) OS.

  The HDD erasure utility 100 first requests the OS to set the highest priority of itself by the priority setting module 101 (FIG. 14 (1)). Next, the CPU number acquisition module 106 acquires the number of CPUs 11 from the OS (FIG. 14 (2)), and the occupied process activation module 107 activates the dedicated processes for the acquired number of CPUs 11 (FIG. 14). (3)). RT-16 in the figure indicates the second highest real-time class priority set by the priority setting module 101. As a result, only the occupying process is executed in parallel with the HDD erasing utility 100.

  Hereinafter, as in the first embodiment, the erase partition image data 150 is written by the erase partition write module 102 (FIG. 14 (4)), and the system reset of the information processing apparatus 1 by the reset driver 103 (FIG. 14 (5)). , And after the system reset, a series of data erasing processes including the start of the HDD erasing OS 151 described above is sequentially performed.

  FIG. 15 is a flowchart showing an operation procedure related to data erasure of the HDD 13 of the information processing apparatus 1.

  The HDD erasure utility 100 sets its own priority to the highest (real-time class P1 = 24) by the priority setting module 101 (step D1 in FIG. 15), and the CPU 11 mounted on the information processing apparatus 1 by the CPU number acquisition module 106. Are obtained from the OS (step D2 in FIG. 15), and the occupied process activation module 107 activates the dedicated processes by the acquired number (step D3 in FIG. 15). At this time, the priority setting module 101 sets the priority of each occupied process to the next highest value (real-time class P1 = 16) of the HDD erasing utility 100.

  When there is no risk of other processing being executed, the erase partition writing module 102 writes the erase partition image data 150 to the head of the HDD 13 (step D4 in FIG. 15), and the system is reset by the reset driver 103 (FIG. 15). Step D5).

  Then, the HDD erasing OS 151 is activated, and data erasure of the HDD 13 is executed in the same procedure as in the first embodiment shown in FIG.

  As described above, even the information processing apparatus 1 of the multiprocessor system according to the present embodiment can completely erase the data on the hard disk storing the operating system in operation.

  Note that the method of the third embodiment can be applied without any problem to a so-called single processor system in which only one CPU 11 is mounted. Therefore, the third embodiment can be used as a common utility for a single processor system and a multiprocessor system. The HDD erasing utility 100 can be stored in the server 2.

  Also, if the maximum number of CPUs 11 is fixed, the dedicated process activation module 107 can start the dedicated process with a fixed maximum number of CPUs without acquiring the number of CPUs 11 by the CPU number acquisition module 106. May be. An exclusive process that has been activated beyond the actual number of mounted devices will only be in a waiting state. In this case, the CPU number acquisition module 106 can be deleted.

  That is, the present invention is not limited to the above-described embodiments as they are, and can be embodied by modifying the components without departing from the scope of the invention in the implementation stage. In addition, various inventions can be formed by appropriately combining a plurality of components disclosed in the embodiment. For example, some components may be deleted from all the components shown in the embodiment. Furthermore, constituent elements over different embodiments may be appropriately combined.

1 is a diagram schematically showing a system configuration of an information processing apparatus according to a first embodiment of the present invention. The figure which shows the network environment of the information processing apparatus of 1st Embodiment The figure which shows the functional block of the HDD deletion utility which operate | moves on the information processing apparatus of 1st Embodiment. The conceptual diagram for demonstrating the flow of a process of the HDD deletion utility which operate | moves on the information processing apparatus of the said 1st Embodiment The conceptual diagram for demonstrating the flow of the process after the system reset by the reset driver of the information processing apparatus of the said 1st Embodiment First flowchart showing an operation procedure related to data erasure of the HDD of the information processing apparatus of the first embodiment. 2nd flowchart which shows the operation | movement procedure in connection with the data deletion of HDD of the information processing apparatus of the said 1st Embodiment The figure which shows the functional block of HDD deletion utility which operate | moves on the information processing apparatus of 2nd Embodiment. The conceptual diagram for demonstrating the flow of a process of the HDD deletion utility which operate | moves on the information processing apparatus of 2nd Embodiment The conceptual diagram for demonstrating the flow of the process after OS restart by the OS restart module of the information processing apparatus of 2nd Embodiment. A flowchart showing an operation procedure related to data erasure of the HDD of the information processing apparatus of the second embodiment. The figure which shows schematically the system configuration | structure of the information processing apparatus which concerns on the 3rd Embodiment. The figure which shows the functional block of HDD deletion utility which operate | moves on the information processing apparatus of the same 3rd Embodiment The conceptual diagram for demonstrating the flow of a process of HDD deletion utility which operate | moves on the information processing apparatus of the same 3rd Embodiment A flowchart showing an operation procedure related to data erasure of the HDD of the information processing apparatus of the third embodiment.

Explanation of symbols

  DESCRIPTION OF SYMBOLS 1 ... Information processing apparatus, 2 ... Server, 11 ... CPU, 12 ... Main memory, 13 ... Hard disk drive (HDD), 14 ... Display controller, 15 ... Keyboard controller, 16 ... Communication controller, 100 ... HDD deletion utility, 101 ... Priority setting module, 102 ... Erase partition writing module, 103 ... Reset driver, 104 ... MBR rewrite module, 105 ... OS restart module, 106 ... CPU number acquisition module, 107 ... Occupied process startup module, 150 ... Erase partition image data 151 ... OS for HDD erasure, 152 ... Ram disk creation module, 153 ... HDD erasure execution module.

Claims (9)

A simple operating system that can be operated without using a hard disk after being loaded and started on the main memory, a ram disk creating program for creating a ram disk on the main memory, and a data erasing program for erasing hard disk data The master boot record set to start the simple operating system, and read when the simple operating system starts, and automatically execute the ram disk creation program and the data erasure program sequentially under the simple operating system Image data writing method in which the image data of the partition including the control data to be written is physically continuously written from the first sector of the hard disk storing the operating system in operation. And,
System resetting means for resetting the system after writing the image data by the image data writing means;
Comprising
The ram disk creation program, after creating the ram disk, sets the environment for operating the simple operating system and programs under the simple operating system using the ram disk as a current disk, and is written to the hard disk An information processing apparatus comprising a procedure for copying the data erasure program in the image data into the ram disk created on the main memory.   2. The apparatus according to claim 1, further comprising priority setting means for setting a priority so that image data writing by the image data writing means and system reset by the system reset means are executed with the highest priority. The information processing apparatus described. CPU number obtaining means for obtaining the number of CPUs;
CPU occupying means for starting up an occupying program for occupying each CPU by the number of CPUs acquired by the CPU number acquiring means;
Further comprising
The priority setting means executes each of the occupied programs activated by the number of CPUs by the CPU occupying means in preference to the image data writing by the image data writing means and the system reset by the system reset means. The information processing apparatus according to claim 2, wherein the priority is set so that the priority is set. A simple operating system that can be operated without using a hard disk after being loaded and started on the main memory, a ram disk creating program for creating a ram disk on the main memory, and a data erasing program for erasing hard disk data The image data of the partition, which is read when the simple operating system is started up and includes control data for sequentially and automatically executing the ram disk creating program and the data erasing program under the simple operating system, Image data writing means for writing to free space of the hard disk storing the system;
MBR rewriting means for rewriting the master boot record of the hard disk so that the simple operating system in the image data written by the image data writing means is activated;
An OS restarting means for requesting a restart to the operating system after the master boot record is rewritten by the MBR rewriting means;
Comprising
The ram disk creation program, after creating the ram disk, sets the environment for operating the simple operating system and programs under the simple operating system using the ram disk as a current disk and is written to the hard disk An information processing apparatus comprising a procedure for copying the data erasure program in the image data into the ram disk created on the main memory.   The image data writing means determines whether the image data is arranged in a physically continuous area of the hard disk, and writes the image data until it is arranged in a physically continuous area of the hard disk. 5. The information processing apparatus according to claim 4, wherein the information processing apparatus is re-executed. A computer having a main memory and a hard disk;
A simple operating system that can be operated without using a hard disk after being loaded and started on the main memory, a ram disk creating program for creating a ram disk on the main memory, and a data erasing program for erasing hard disk data The master boot record set to start the simple operating system, and read when the simple operating system starts, and automatically execute the ram disk creation program and the data erasure program sequentially under the simple operating system Image data writing method in which the image data of the partition including the control data to be written is physically continuously written from the first sector of the hard disk storing the operating system in operation. ,
System resetting means for resetting the system after writing the image data by the image data writing means;
Function as
The ram disk creation program, after creating the ram disk, sets the environment for operating the simple operating system and programs under the simple operating system using the ram disk as a current disk, and is written to the hard disk A hard disk data erasing program comprising a step of copying the data erasing program in the image data into the ram disk created on the main memory. A computer having a main memory and a hard disk;
A simple operating system that can be operated without using a hard disk after being loaded and started on the main memory, a ram disk creating program for creating a ram disk on the main memory, and a data erasing program for erasing hard disk data The image data of the partition, which is read when the simple operating system is started up and includes control data for sequentially and automatically executing the ram disk creating program and the data erasing program under the simple operating system, Image data writing means for writing to free space of the hard disk where the system is stored,
MBR rewriting means for rewriting the master boot record of the hard disk so that the simple operating system in the image data written by the image data writing means is started,
An OS restarting means for requesting a restart to the operating system after the master boot record is rewritten by the MBR rewriting means;
Function as
The ram disk creation program, after creating the ram disk, sets the environment for operating the simple operating system and programs under the simple operating system using the ram disk as a current disk, and is written to the hard disk A hard disk data erasing program comprising a step of copying the data erasing program in the image data into the ram disk created on the main memory. A hard disk data erasing method applied to an information processing apparatus having a main memory and a hard disk,
A simple operating system that can be operated without using a hard disk after being loaded and started on the main memory, a ram disk creating program for creating a ram disk on the main memory, and a data erasing program for erasing hard disk data The master boot record set to start the simple operating system, and read when the simple operating system starts, and automatically execute the ram disk creation program and the data erasure program sequentially under the simple operating system Writing the image data of the partition including the control data for causing the data to be physically continuous from the top sector of the hard disk storing the operating system in operation;
Resetting the system after writing the image data;
Comprising
The ram disk creation program, after creating the ram disk, sets the environment for operating the simple operating system and programs under the simple operating system using the ram disk as a current disk, and is written to the hard disk A hard disk data erasing method comprising a step of copying the data erasing program in the image data into the ram disk created on the main memory. A hard disk data erasing method applied to an information processing apparatus having a main memory and a hard disk,
A simple operating system that can be operated without using a hard disk after being loaded and started on the main memory, a ram disk creating program for creating a ram disk on the main memory, and a data erasing program for erasing hard disk data The image data of the partition, which is read when the simple operating system is started up and includes control data for sequentially and automatically executing the ram disk creating program and the data erasing program under the simple operating system, Writing to free space on the hard disk where the system is stored;
Rewriting the master boot record of the hard disk so that the simplified operating system in the written image data is activated;
After rewriting the master boot record, requesting a restart to the operating operating system;
Comprising
The ram disk creation program, after creating the ram disk, sets the environment for operating the simple operating system and programs under the simple operating system using the ram disk as a current disk, and is written to the hard disk A hard disk data erasing method comprising a step of copying the data erasing program in the image data into the ram disk created on the main memory.

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