JP2010165377A - Information processing apparatus, image processing apparatus, information processing method, computer program, and recording medium - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To save time and effort for creating data on a memory to be transferred to a large capacity storage means for erasing the data in the large capacity storage means to enhance performance of data erase in an image processing apparatus. <P>SOLUTION: In operation processing of an image accumulation control part which a digital copying machine has, a data bus switching bit is set to 1 (S502) after setting an erase starting point address, an end point address of an erase starting point address register, an erase end point address register (S501), and data on a register for substitute data is selected. Next, the image accumulation control part starts HDD data erase operation (S505) by setting 1 in a HDD data erase starting bit by a mounted CPU (S504) after setting a value in the register for substitute data (S503). When data writing to the end point address is completed, the image accumulation control part issues an end interruption to the CPU by end interruption generation (S506) to notify the end of the data erase operation. <P>COPYRIGHT: (C)2010,JPO&INPIT

Description

  The present invention has storage means for storing digital data, and information processing devices such as PCs, HD recorders, car navigation systems, game machines, etc. in consideration of the security of the data stored in the storage means, and the digital data is image data. The present invention relates to an image processing apparatus applied to image processing at a certain time, an information processing method common to these apparatuses, a program to which the information processing method is applied, and a recording medium on which the program is recorded.

  Conventionally, some digital copying machines are equipped with a non-volatile storage medium such as a hard disk (hereinafter referred to as HDD), and this HDD is used for a function for storing and using image data once such as an electronic sort function and an image registration function. Yes. The electronic sort function reads a document, stores it in the HDD, reads all images, stores them in the HDD, reads these images from the HDD in order of pages, and prints them out. As a result, even without a sorter device having a plurality of bins, the copy sheets can be discharged in a sorted state. In addition, the image registration function stores a plurality of form images in advance in the HDD as registered images, so that it can be printed out as many times as necessary without being read again by the scanner.

  For example, the invention disclosed in Patent Document 1 is known as this type of technology. The present invention provides an image forming apparatus including a hard disk controller that can transfer image data to a plurality of HDDs at a high speed with a simple configuration and that can efficiently manage a plurality of HDDs as one HDD. The hard disk controller is configured to control parameter setting, command issuance, status reading, and the like for a plurality of HDDs substantially simultaneously, and to transfer image data and perform DMA transfer substantially simultaneously. It is.

  However, the HDD can retain data and use it as described above. However, if the data is not erased by a command or the like, the data is retained indefinitely. If it is illegally removed from the device, the data may be stolen. There is a security problem. Even in the data erasure performed by the command, each previously written 1-bit data area cannot be completely rewritten by one-time data overwriting, and an unrewritten data portion remains. Thus, magnetic data remains on the disk surface and is not completely rewritten by writing once. Thus, all the remaining magnetic data portions are rewritten stochastically so that all remaining magnetic data portions are rewritten. Data must be overwritten as many times as possible. For this purpose, the same data, for example, 0 is written the number of times or a random number is written the number of times, and the latter random number is generally used. At that time, it is conceivable to create data on the memory, create the data several times, and write it to the HDD. However, it is necessary to create and transfer the data on the memory, which is troublesome.

  The present invention has been made to solve such problems, and its technical problem is to create data on a memory to erase data in a mass storage means such as an HDD and store it in a large capacity. An object of the present invention is to provide an information processing apparatus, an image processing apparatus, an information processing method, a computer program, and a recording medium that can save the time and effort of transferring data to the means and improve data erasing performance.

  In order to achieve the above technical problem, an information processing apparatus according to the present invention includes a large-capacity storage unit for storing data, and a storage control unit that controls reading / writing of the data with respect to the large-capacity storage unit. And a control means for controlling the entire apparatus, and the storage control means includes a register readable / writable by the control means, and decodes a command set in the register by the control means And an instruction means for instructing generation of a signal for instructing read / write to the large-capacity storage means; a register for setting data; a register that can be read / written by the control means; Switching means for switching write data to the capacity storage means to either the register value for data setting or other data; and A register for designating whether to write to the capacity storage means, either the register value or the other data, wherein the data setting register is the large-capacity storage means A register for designating a start point and an end point of a data write address to the memory, and a register for starting data write to the mass storage means, and the storage control means uses the register value as an instruction from the instruction means. Alternatively, by instructing data writing by the register for starting data writing instead of the register for specifying any of the other data, the start point and end point of the data write address to the mass storage means are set. Write the value set in the data setting register to the address specified in the specified register And wherein the door.

  In one embodiment of the information processing apparatus, the data setting register includes a random number initial value register and a random number generation unit that generates a random number based on a value of the random number initial value register, and the storage control unit Then, as an instruction from the instruction means, instead of a register that specifies whether to use the register value or the other data, an instruction to write data by the register for starting data writing to the mass storage means is instructed. By doing so, the value generated by the random number generator is written to the address designated by the register designating the start point and end point of the data write address to the mass storage means.

  The image processing apparatus according to the present invention stores an input means for inputting image data, a control means for controlling the overall operation of the apparatus, and image data input from the input means for at least one page. A large-capacity storage means for storing image data, read / write control for the image data to the memory, and read / write of the image data to the large-capacity storage means An image storage control unit for controlling, and further, the image storage control unit includes a register readable / writable by the control unit, and decodes a command set in the register by the control unit. CPU I / F for instructing DMA generation for memory data transfer and signal generation for instructing read / write to mass storage means And a data setting register readable / writable by the control means, a switching means for switching the write data to the mass storage means between the data setting register value and the data from the memory, A register for designating whether to write to the capacity storage means, either the register value or the data from the memory, wherein the data setting register is the large-capacity storage A register for designating a start point and an end point of a data write address to the means, and a register for starting data write to the mass storage means, and the image accumulation control unit includes an instruction from the CPU I / F unit. Instead of the register that specifies whether the register value or the other data is used, The value set by the data setting register at the address specified by the register for designating the start point and end point of the data write address to the mass storage means by instructing data writing by the register for starting data writing to the means It is characterized by writing.

  In one embodiment of the image processing apparatus, the data setting register includes a random number initial value register, and a random number generator that generates a random number based on a value of the random number initial value register, and the image accumulation control In the unit, in place of the register specifying whether to use the register value or the other data from the CPU I / F unit, data writing by the register for starting data writing to the mass storage means is instructed. By doing so, the value generated by the random number generator is written to the address designated by the register designating the start point and end point of the data write address to the mass storage means.

  On the other hand, in the information processing method of the present invention, the step of setting the erase start point address when erasing the data of the mass storage means in the register and the end point address when erasing the data of the mass storage means are set in the register. And erasing the data stored on the mass storage means by overwriting predetermined data on the data between the erasing start point address and end point address set in the register. Further, the step of erasing the data includes a step of switching a data bus, selecting data in a replacement data register, a step of setting a value in the replacement data register, a step of instructing start of erasure, An information processing method comprising: issuing an end interrupt after the data writing to the end point address is completed; and A step of eliminating data between the erase start address after seeing issuance of the end address, and having a a step of repeated among the processes the address to erase the data.

  One embodiment of the information processing method is characterized in that the predetermined data in the step of erasing the data is a random number.

  On the other hand, the computer program of the present invention stores information on the procedure for setting the erasure start point address in the register when erasing the data in the mass storage means and the end point address in erasing the data in the mass storage means. A procedure for erasing data stored on the large-capacity storage means by overwriting predetermined data on information between the procedure information to be set and data between the erase start point address and end point address set in the register In addition, the information on the procedure for erasing the data includes the information on the procedure for switching the data bus and selecting the data in the replacement data register, and the procedure for setting the value in the replacement data register. Information and a procedure information for instructing the start of erasure, the computer program comprising: Information on a procedure for issuing an end interrupt after completion of data write, information on a procedure for erasing data between the erase start point address and the end address after issuing the end interrupt, and a procedure for erasing the data between the addresses. And the procedure information to be repeated.

  In one embodiment of the computer program, the information on the procedure for erasing the data is a procedure for writing a random number generated based on an initial value read from a random number initial value register between the erasing start point address and the end address. It is characterized by being information.

  The recording medium of the present invention is characterized in that all of the procedure information in any one of the above computer programs is read and executed by a computer.

  In the following embodiments, the mass storage means is in the HDD 208, the storage control means is in the image accumulation control unit 205, the control means is in the CPU 202, and a register that can be read / written by the control means is in the rewrite data register 205a. The instruction means corresponds to the data path switching bit 205b, the random number initial value register corresponds to the reference numeral 205e, the random number generator corresponds to the reference numeral 205f, the switching means corresponds to the image accumulation control section 205, and the memory corresponds to the reference numeral 206.

  According to the present invention, it is possible to save the trouble of creating data on the memory and transferring it to the large-capacity storage means in order to erase the data in the large-capacity storage means, thereby improving the data erasure performance. it can.

1 is a schematic diagram illustrating a basic configuration of a digital copying machine according to Embodiment 1 of the present invention. FIG. 2 is a block diagram showing a basic configuration of a control unit in the digital copying machine shown in FIG. 1. It is the figure which simplified and showed the path | route by which the data from the memory which concerns on control of the control part shown in FIG. 2 are replaced by the value set to the replacement data register. FIG. 6 is a diagram showing a simplified path in which data from a memory related to control of a control unit in a digital copying machine according to Embodiment 2 of the present invention is replaced with random number data. 10 is a flowchart showing an operation process of a procedure for erasing data using an HDD data erasure start bit provided in a control register in an image accumulation control unit provided in a digital copying machine according to Embodiment 3 of the present invention. FIG. 6 is a diagram schematically illustrating a state of an HDD I / F when an HDD data erasing operation is performed in the image accumulation control unit described in FIG. 5.

  Hereinafter, an information processing apparatus, an image processing apparatus, an information processing method, a computer program, and a recording medium according to the present invention will be described in detail with reference to the accompanying drawings.

  FIG. 1 is a schematic diagram showing a basic configuration of a digital copying machine according to Embodiment 1 of the present invention. This digital copying machine basically includes a scanner unit 101, a laser recording unit 102, and a post-processing unit 103. The scanner unit 101 and the laser recording unit 102 form an image and print on paper, and the post-processing unit 103 aligns the output paper and performs staple and punch hole processing.

  The scanner unit 101 is placed on a platen 104 made of a transparent glass body (contact glass), an automatic double-sided document feeder 105 (hereinafter referred to as RADF) for feeding a document on the top surface of the document table 104, and a top surface of the document table 104. The scanner unit 106 reads an image of a placed document. Image data read by the scanner unit 101 is output to the laser recording unit 102. The RADF 105 reverses the front and back surfaces of a document on which a single-sided image feed path from the document tray (not shown) to the discharge tray (not shown) via the document table 104 and the scanner unit 106 has read the image on one side again. It has a double-sided document feed path leading to the document table 104, and can handle both single-sided and double-sided documents. The scanner unit 106 irradiates a document with a lamp, and forms an image of reflected light of the document on a light receiving surface of a photoelectric conversion element with a lens, a mirror, or the like. The photoelectric conversion element converts the reflected light on the image surface of the document into an electrical signal and outputs the electrical signal to an image processing unit described later. The laser recording unit 102 includes a paper transport unit 107 that transports paper, a laser writing unit 108, and an electrophotographic process unit (image forming unit) 109. The paper transport unit 107 includes a sub transport path that reverses the front and back surfaces of the paper that has passed through the fixing roller and guides it to the electrophotographic process unit 106 again in the double-sided copying mode in which images are formed on both sides of the paper.

  The laser writing unit 108 is a semiconductor laser that emits laser light based on the image data supplied from the image processing unit, and the light emitted from the semiconductor laser is arranged on the surface of the photosensitive drum of the electrophotographic process unit 109 through a mirror or a lens. Shine. An electrostatic latent image is formed on the surface of the photosensitive drum, and the toner image is made visible by supplying toner from the developing device. The toner image is transferred onto the paper guided from the paper transport unit 107, and then heated and pressurized by the fixing roller, and the toner image is melted and fixed on the surface of the paper. After the writing on the paper is completed in this way, a part of the output paper is aligned in the post-processing unit 103, the staple and punch holes are processed, and the paper is discharged to the tray.

  FIG. 2 is a block diagram showing the basic configuration of the control unit in the above-described digital copying machine. The control unit controls the devices constituting each unit by the CPU 202 mounted on the image processing board 201 via the CPUs 226, 230, and 213 mounted on the boards arranged for each unit. That is, the control unit includes an operation panel board 228 for managing an operation panel 225 provided on the upper surface of the copying machine, a machine control board 231 for managing each device in the copying machine, and a CCD board 210 on which photoelectric conversion elements are mounted together with peripheral components. In addition, the image processing board 201 is mounted with a CPU 202 that performs various image processing on the image data together with peripheral components.

  Specifically, the machine control board 231 includes a CPU 230 and a RAM 229, and is connected to the RADF 105, the paper transport unit 107, the post-processing unit 103, the duplex unit 217, the scanner unit 106, and the process unit 109. The RADF 105 and the post-processing unit 103 are provided with CPUs 221 and 222, respectively. The operation panel board 228 includes a CPU 226 and a RAM 227, and an operation panel 225 is connected to the operation panel board 228. The operation panel 225 is provided with an LCD (Liquid Crystal Display) 223 and operation keys 224.

  Hereinafter, processing of image data in copy mode in the digital copying machine will be described. The image of the document fed to the document table 104 via the RADF 105 is sequentially read by the scanner unit 106. The CCD 213 on the CCD board 210 in the scanner unit 106 is driven by the CCD control unit 212, the output signal is subjected to gain adjustment by the analog circuit 214, and the image processing board is converted into 8-bit image data from the A / D conversion unit 211. 201. The image data sent to the image processing board 201 is subjected to predetermined image processing in the image processing unit 204 and then stored in the memory 206 once by the image accumulation control unit 205. Next, the image data stored in the memory 206 is stored in the HDD 208. These processes are executed for all documents set in the RADF 105. After the image reading is completed, the image accumulation control unit 205 repeatedly reads out a plurality of pieces of image data stored in the HDD 208 in the order of pages, and after the predetermined image processing in the image processing unit 204, the laser is read out. The laser beam is supplied to the semiconductor laser 209 of the laser writing unit 108 via the control unit 207. Therefore, even when a plurality of copies of each original image are formed, it is only necessary to read the original image once.

  The digital copying machine according to the first embodiment includes a “replacement data register” 205a that can set 16-bit data in the image accumulation control unit 205 (see FIG. 3 described later). Another control register has one data path switching bit 205b. If the data path switching bit 205b is 0, the data from the memory 206 is transferred to the HDD 208, and if it is 1, the value set in the replacement data register 205a is written to the HDD 208.

  FIG. 3 is a diagram showing a simplified path in which the data from the memory 206 related to the control of the control unit is replaced with the value set in the replacement data register 205a. Here, if the data path switching bit 205b is 0, the HDD write data 205d is connected to the path 205c from the memory 206, and if it is 1, it is connected to the “replacement data register”. In this way, data is not written in the memory 206 by software and transferred, and the data in the HDD 208 is not rewritten. Instead, the value in the register 205a is set and the data path switching bit is set to 1. Is performed in the HDD 208, the value set in the register 205a is written in the HDD 208. Therefore, it is possible to save the trouble of creating data for erasing the HDD in the memory 206 and to increase the speed of erasing the HDD data by slightly changing the normal control.

  Note that writing of data for erasing the HDD is performed a plurality of times in order to overwrite all the magnetic data and prevent erasure omission as described above. There are various erasing timings, such as the timing of the user's support, the copier's disposal, and the least probable use of the user, such as midnight or dawn, immediately after the end of work, and immediately after the end of one job. It is appropriately set according to the usage pattern and the degree of confidentiality. In addition, when data is being erased, the fact is displayed on the LCD 223 of the operation panel 225, and further displayed at the time of completion or completion so that the user can confirm that the data has been erased. Is desirable.

  For example, when erasing data at midnight, the HDD 208 is already set when the power is set to the energy saving mode after erasure, or when the power is turned on at the start of work after the power is turned off, or when returning from the energy saving mode. It can also be set to display that the data has been deleted.

  By the way, if the HDD erasing data is a random number, it is more effective for erasing the data of the HDD 208. In the second embodiment of the present invention, the effect of data erasure can be enhanced by providing a “random number initial value register” 205e and a random number generator 205f (see FIG. 4 described later). This system includes a random number initial value register 205e that can set 16-bit data. Another control register has one data path switching bit 205b. If the data path switching bit 205b is 0, the data from the memory 206 is transferred to the HDD 208, and if it is 1, the random number data generated by the random number generator 205f based on the value set in the random number initial value register 205e. Is written to the HDD 208.

  FIG. 4 is a diagram showing a simplified path in which data from the memory 206 related to the control of the control unit in the digital copying machine according to the second embodiment of the present invention is replaced with random number data. Here, if the data path switching bit 205b is 0, the HDD write data is connected to the path 205c from the memory 206, and if it is 1, it is connected to the data from the random number generator 205f. In this way, the software does not write the data in the memory 206, transfers it, and rewrites the data in the HDD 208, but sets the value in the register 205 e and sets the data path switching bit to 1 to store the data in the memory 206. Is performed in the HDD 208, the value set in the register 205e is written in the HDD 208. Therefore, it is possible to save time and effort for creating data for erasing the HDD in the memory 206 with only a slight change in normal control, to increase the speed of erasing the HDD data, and to write random data that is difficult to restore. Can do.

  Other parts that are not particularly described are configured in the same manner as in the first embodiment described above, and function in the same manner.

  In the digital copiers of the first and second embodiments described above, one of the advantages is that the data on the HDD 208 can be rewritten in the same manner as the image data transfer from the memory 206. However, the digital copier of the third embodiment Then, it is possible to rewrite the data in the HDD 208 with a simpler process.

  In the digital copying machine of the third embodiment, an “erase start point address register” and an “erase end point address register” are provided in the image accumulation control unit 205. The address inside the HDD 208 is a value called LBA (Logical Block Address), which is a 28-bit value. This 28-bit value is composed of values written in four registers in the HDD 208. If these registers are LBA [27: 0], 1) LBA [27:24]: lower 4 bits of the device head register, 2) LBA [23:16]: cylinder high register, 3) LBA [15: 8 ]: Cylinder row register, 4) LBA [7: 0]: Sector number register. In this embodiment, an HDD data erasure start bit is provided in the control register of the image accumulation control unit 205.

  FIG. 5 is a flowchart showing an operation process of a procedure for erasing data using the HDD data erasure start bit provided in the control register in the image accumulation control unit 205 provided in the digital copying machine according to Embodiment 3 of the present invention. It is. First, the CPU 202 sets the erase start point address and end point address of the “erase start point address register” and “erase end point address register” (step S501). Then, the data path switching bit is set to 1 (step S502), and data in the replacement data register is selected. Next, a value is set in the replacement data register (step S503). When the CPU 202 sets 1 to the HDD data erasure start bit (step S504), the image accumulation control unit 205 starts the HDD data erasure operation (step S505). When the data writing to the end point address is completed, the image accumulation control unit 205 notifies the end of the data erasing operation by issuing an end interrupt to the CPU as an end interrupt is generated (step S506).

  FIG. 6 is a diagram schematically showing the state of the HDD I / F at the time of execution of the HDD data erasing operation in the image accumulation control unit 205 here. In FIG. 6, the HDD register setting portion where the above-described LBA setting or DMA write command is performed on the HDD interface is indicated by A to E. In these HDD register setting portions, the device head register, cylinder high register, cylinder low register, and sector number register set the LBA. By setting 00H in the sector count register, the maximum 256-sector data write is performed, so the value of 00H is set in the sector count register. Finally, a write DMA command is issued to the command register to transfer data.

  In part A, the LBA set in the “erase start point address register” is set in the HDD 208 as the LBA. In the B portion, an address obtained by incrementing the address set in the A portion by the data write of 256 sectors is set, 00H is set in the sector count register, a write DMA command is issued to the command register, and data is transferred. Similarly, for the C part and the D part, the LBA is incremented and set by 256 sectors, and similarly, the sector count register is set to 00H and the write DMA command is issued to the command register. Finally, when the data transfer is completed by issuing the LBA of the “erasure end point address register” in the E part, the image accumulation control unit 205 issues an end interrupt to the CPU 202 to notify the end of the data erase operation. In this way, the HDD data erasing operation can be performed only by simple register setting without setting the memory data transfer such as the transfer data amount of the memory 206 by the image accumulation control unit 205.

  FIG. 6 illustrates a case where the image accumulation control unit 205 issues an end interrupt to the CPU 202 to notify the end of the data erasing operation. This is because the CPU 202 does not know the end of data transfer. Instead of the end interrupt, the number of command occurrences (transfer count) may be used. If the number of transfers is known in advance in relation to the amount of data, the CPU 202 knows the end of data transfer from this number.

  Other parts that are not particularly described are configured in the same manner as in the first embodiment described above, and function in the same manner.

  According to the third embodiment, when the HDD 208 is used in a system such as a digital copying machine, data transferred from the memory 206 to the HDD 208 by the control unit is replaced with a register value set by the CPU 202 and transferred to the HDD 208. A value for erasing data can be easily written to the HDD 208 without creating data on the memory 206.

  Further, according to the third embodiment, since the random number is written, the hardware of the random number generation unit 205f increases. However, using the random number as the erasing data makes it difficult to restore the erased data.

  Further, although hardware such as a register increases, it is not necessary to perform control as data transfer from the memory 206, and data for a specified address can be erased, so that control is simplified.

  In each of the embodiments described above, the digital copying machine as an image forming apparatus has been described as an example. However, an image processing apparatus that functions in the preceding stage of the image processing means when performing image formation, or a memory that stores digital data. Needless to say, the present invention can also be applied to an information processing apparatus such as a PC, an HD recorder, a car navigation system, and a game machine in consideration of the security of data stored in the storage means.

DESCRIPTION OF SYMBOLS 101 Scanner part 102 Laser recording part 103 Post-processing part 201 Image processing board 202 CPU
204 Image processing unit 205 Image accumulation control unit 205a Replacement data register 205b Data path switching bit 205e Random number initial value register 205f Random number generation unit 206 Memory 208 HDD
210 CCD board 223 LCD
224 operation keys 225 operation panel 228 operation panel board 231 machine control board

JP 2002-354217 A

Claims (9)

A large-capacity storage means for storing data; a storage control means for controlling read / write of the data with respect to the large-capacity storage means; and a control means for controlling the entire apparatus; The storage control means includes a register that can be read / written by the control means, and also performs a read / write instruction to the mass storage means by decoding a command set in the register by the control means. Including an instruction means for instructing signal generation, a register for data setting, a register readable / writable by the control means, and a register value for data setting or other data to be written to the mass storage means Switching means for switching to any one of the data, and writing to the mass storage means the register value or the An information processing apparatus having the a register for specifying whether any of the data, and
The data setting register includes a register for designating a start point and an end point of a data write address to the mass storage means, and a register for starting data write to the mass storage means,
In the storage control means, as an instruction from the instruction means, an instruction to write data by the register for starting data writing is given instead of a register for specifying either the register value or the other data. To write the value set in the data setting register to the address designated by the register designating the start point and end point of the data write address to the mass storage means. 2. The information processing apparatus according to claim 1, wherein the data setting register includes a random number initial value register, and a random number generation unit that generates a random number based on a value of the random number initial value register,
In the storage control means, as an instruction from the instruction means, a register for starting data writing to the large-capacity storage means is used instead of a register that designates either the register value or the other data. An information processing apparatus, wherein the value generated by the random number generator is written to an address designated by a register designating a start point and an end point of a data write address to the mass storage means by instructing data writing. Input means for inputting image data, control means for controlling the overall operation of the apparatus, memory for storing at least one page of image data input from the input means, and for storing image data A large-capacity storage unit, and a read / write control for the image data with respect to the memory, and an image accumulation control unit for controlling the read / write of the image data with respect to the large-capacity storage unit. Further, the image accumulation control unit includes a register that can be read / written by the control unit, and decodes a command set in the register by the control unit to read / write to the large-capacity storage unit. CPU I / F unit for instructing signal generation and DMA activation for memory data transfer, read by the control means A writable data setting register, a switching means for switching data written to the mass storage means between the data setting register value and data from the memory, and writing to the mass storage means A register for designating either a register value or data from the memory, and an image processing apparatus comprising:
The data setting register includes a register for designating a start point and an end point of a data write address to the mass storage means, and a register for starting data write to the mass storage means,
In the image accumulation control unit, instead of a register that designates whether to use the register value or the other data as an instruction from the CPU I / F unit, data write start to the mass storage means The value set by the data setting register is written to the address designated by the register for designating the start point and end point of the data write address to the mass storage means by instructing the data write by the register Image processing device. 4. The image processing apparatus according to claim 3, wherein the data setting register includes a random number initial value register and a random number generation unit that generates a random number based on a value of the random number initial value register,
The image accumulation control unit is used to start writing data into the large-capacity storage means instead of a register that designates either the register value or the other data as an instruction from the CPU I / F unit. The value generated by the random number generator is written to an address designated by a register for designating a start point and an end point of a data write address to the mass storage means by instructing data writing by the register Processing equipment. A step of setting in the register an erasing start point address when erasing data of the large capacity storage means, a step of setting in the register an end point address when erasing data of the large capacity storage means, and a setting of the register Erasing the data stored on the mass storage means by overwriting predetermined data on the data between the erasing start point address and the end point address, and further erasing the data Is an information processing method including a step of switching data buses and selecting data in a replacement data register, a step of setting a value in the replacement data register, and a step of instructing start of erasure,
A step of issuing an end interrupt after the data writing to the end point address is completed, a step of erasing data between the erase start point address and the end address after issuing the end interrupt, and a step of erasing the data And a step of repeating between addresses.   6. The information processing method according to claim 5, wherein the predetermined data in the step of erasing the data is a random number. Information on the procedure for setting the erase start point address in the register when erasing the data in the mass storage means, information on the procedure for setting in the register the end address when erasing the data in the mass storage means, and the register Information on a procedure for erasing data stored on the mass storage means by overwriting predetermined data on data between the erasing start point address and end point address set to Information on the procedure for erasing data includes information on a procedure for switching data buses and selecting data in a replacement data register, information on a procedure for setting a value in the replacement data register, and a procedure for instructing the start of erasure A computer program comprising:
Information on a procedure for issuing an end interrupt after the data writing to the end point address is completed, information on a procedure for erasing data between the erase start point address and the end address after issuing the end interrupt, and erasing the data And a procedure program for causing the procedure to be repeated between the addresses.   8. The computer program according to claim 7, wherein the information on the procedure for erasing the data is a procedure for writing a random number generated based on an initial value read from a random number initial value register between the erasing start point address and the end address. A computer program characterized by being information.   9. A recording medium in which all of the procedure information in the computer program according to claim 7 is read by a computer and recorded so as to be executable.

Images