JP3888010B2 - Disk controller - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a disk control device, and more particularly to a disk control device that controls the operation of a disk device that stores information such as a hard disk.
[0002]
[Prior art]
In general, a hard disk is driven to rotate a disk-shaped recording medium by a spindle motor. However, because the spindle motor is structurally weak against external shock during rotation, it is accessed due to external shock. The head and the recording medium are likely to come into contact with each other, and defective sectors are likely to occur.
[0003]
Further, the surface of a hard disk recording medium may be scratched by contact between the head and the recording medium due to vibration, impact, or the like, even if a defective sector does not occur. In this case, access may become impossible at the moment when the scratch is made, and depending on the state, the number of retries when an address is accessed for a subsequent scratched recording area may increase. Even if there is no problem in actual use at this point, if the address is accessed frequently, the damage may be accelerated and the access may become impossible in the future.
[0004]
In general, a defective sector already exists from the time of initialization, and is also generated due to magnetic degradation, etc., but in the market after being mounted on an image processing apparatus of a digital copying machine, It is often caused by vibration and shock.
[0005]
On the other hand, the processing speed of digital image processing devices has been increasing year by year, causing problems such as an increase in the number of retries for accessing a hard disk used for storing image data, and sudden failure in writing and reading. This immediately leads to a stop of the image processing apparatus or a decrease in performance.
[0006]
In response to such a problem, Japanese Patent Application Laid-Open No. 5-130545 discloses that an operation of recording an image signal on a recording medium is stopped or an image signal recorded on the recording medium according to a detection result by the vibration detecting unit. A technique for verifying is described.
[0007]
Japanese Patent Laid-Open No. 10-65891 discloses a technique for measuring the number of times an error has occurred and the required time when accessing a recording medium, and setting the corresponding area as a use-prohibited area when the specified value is exceeded. As described above, according to this technique, the certainty of error detection can be improved.
[0008]
Japanese Laid-Open Patent Publication No. 10-162529 discloses a work in process that is saved in a memory when abnormal vibration is detected after a detection signal from a vibration sensor returns from an abnormal value to a normal value and after a hard disk inspection is performed. A technique for re-executing the contents from the beginning is described.
[0009]
Further, in Japanese Patent Laid-Open No. 10-11881, when the vibration detected by the vibration detecting means is larger than a predetermined amount, data access to the information recording apparatus is prohibited, and when the vibration is less than the predetermined amount, the above access is made. The technology allowed is described. This technology is for moving objects, and the vibration detecting means is installed in front of the moving direction of the object, and until the information recording apparatus actually receives vibration after the vibration is detected by the vibration detecting means. In this time, the head is moved from the operating point to the retracted point.
[0010]
[Problems to be solved by the invention]
However, in the techniques described in Japanese Patent Laid-Open Nos. 5-130545, 10-162529, and 10-11881, the abnormal vibration is used to access the recording medium after the abnormal vibration is detected. If the period until the impact is short, it is often impossible to prevent damage to the recording medium. In this case, the number of times of retrying access to the recording medium is increased or a sudden inaccessible state is not detected. There was a problem that the occurrence could not be prevented.
[0011]
Further, since the technique described in Japanese Patent Laid-Open No. 10-65891 sets a use-prohibited area according to the state during access to the recording medium, the recording medium is damaged by abnormal vibration. In such cases, there are problems such as an increase in the number of retries for subsequent access to the recording medium and a sudden inaccessibility state cannot be prevented.
[0012]
The present invention has been made to solve the above problems, and an object of the present invention is to provide a disk control device capable of preventing an increase in the number of access retries to a recording medium and the occurrence of a sudden inaccessible state. And
[0013]
[Means for Solving the Problems]
In order to achieve the above object, a disk control device according to claim 1 is a disk control device for controlling a disk device for storing information, a detection means for detecting vibrations of the disk device, and the disk device. For writing or reading information When the detection means detects a vibration of a predetermined level or more during access, the storage area corresponding to the address being accessed is stored. , Access If this is an information write, after the access, if the access is an information read, the remaining information was read In addition to performing processing for prohibiting subsequent use, when the access is in the process of reading information, the rest of the information is read and stored in a storage means different from the disk device, or the read information is stored in the predetermined information And a prohibition processing means for storing in a storage area corresponding to an address different from the address of the disk device after the vibration of the level or more is finished.
[0014]
According to the disk control device of the first aspect, the vibration of the disk device storing information is detected by the detecting means. The detection means includes all vibration sensors such as variable capacitance pickups, electrodynamic pickups, piezoelectric pickups, and eddy current pickups. The disk device includes all disk devices having a recording medium and a head for accessing the recording medium, such as a hard disk drive, a floppy disk drive, a compact disk drive, and a magneto-optical disk drive.
[0015]
Further, in the disk control device according to claim 1, when the detecting means detects a vibration of a predetermined level or more during access to the disk device, the processing for prohibiting the subsequent use of the storage area corresponding to the accessed address. Is performed by prohibition processing means. As the predetermined level, a value corresponding to the magnitude of vibration that may cause damage to the recording medium in the disk device when it occurs during access of the disk device, a value slightly smaller than the value, etc. is applied. Can do.
[0016]
Thus, according to the disk control device of the first aspect, for the disk device, For writing or reading information When vibration of a predetermined level or more is detected during access, the storage area corresponding to the address being accessed If the access is an information write, after the access, if the access is an information read, the remaining information is read Since subsequent use is prohibited, it is possible to prevent an increase in the number of access retries to the recording medium due to damage to the recording medium due to vibrations and the occurrence of a sudden inaccessible state.
[0017]
According to a second aspect of the present invention, in the disk control device according to the first aspect, the information is written when the detection means detects a vibration of a predetermined level or higher when information is written to the disk device. It further comprises holding means for holding information.
[0018]
According to a second aspect of the present invention, in the disk control device according to the first aspect, the information is written when the detection means detects a vibration of a predetermined level or higher while writing information to the disk device. Information is held by holding means.
[0019]
As described above, according to the disk control device of the second aspect, the same effect as that of the first aspect of the invention can be achieved, and vibrations of a predetermined level or more can be generated when information is written to the disk device. When detected, since the written information is held, accurate information can be obtained by reading the held information when reading the information.
[0020]
According to a third aspect of the present invention, there is provided the disk control device according to the second aspect, wherein the holding means is different from the disk device in the written information. Above The information stored is stored in a storage means or the written information is stored in a storage area corresponding to an address different from the address being accessed of the disk device after the vibration of the predetermined level or more is finished. It is characterized by holding.
[0021]
According to the disk control device of the third aspect, the holding means according to the second aspect holds the written information by being stored in a storage means different from the disk device, or the writing is performed. Is stored in a storage area corresponding to an address different from the address being accessed of the disk device after the vibration of the predetermined level or more is finished. Although any recording medium can be applied as the storage means, it is particularly preferable to apply a semiconductor memory such as a RAM, EEPROM, flash memory and the like that is not affected by vibration.
[0022]
As described above, according to the disk control device of the third aspect, when the vibration of a predetermined level or more is detected when information is written to the disk device, the written information is stored differently from the disk device. Or by storing it in a storage area corresponding to an address different from the address being accessed after the end of the vibration of a predetermined level or more. Therefore, the written information can be securely held.
[0023]
DETAILED DESCRIPTION OF THE INVENTION
Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings. In this embodiment, the case where the disk control device of the present invention is applied to a digital copying machine will be described.
[0024]
[First Embodiment]
First, the configuration of a digital copying machine 10 to which the present invention is applied will be described with reference to FIG.
[0025]
As shown in the figure, the digital copying machine 10 according to the present embodiment includes an image input device 20 serving as an image input unit, and an image that performs various image processing on actual image data input from the image input device 20. The image processing apparatus 30 includes an image output apparatus 40 that prints out the actual image data image-processed by the image processing apparatus 30 as a visible image.
[0026]
The image input device 20 has an automatic document feeder 21 that can continuously feed a plurality of documents on the platen glass, and an exposure lamp 22 and a reflection mirror 23 as a scanner unit that reads and scans the image of the document placed on the platen glass. , An imaging lens 24 and a CCD sensor 25. Reflected light from the document based on the light emitted from the exposure lamp 22 forms an image on the imaging surface of a CCD sensor 25 that is a photoelectric conversion element via a reflection mirror 23 and an imaging lens 24.
[0027]
On the other hand, the control system includes an operation panel 26 serving as a user interface (UI) and an image input control unit 27 for controlling the entire image input apparatus 20 including the automatic document feeder 21 and the scanner unit. The image input control signal output from the image processing device 30 is input to the image input control unit 27. The operation panel 26 is provided with switches for inputting various instructions from the operator and a display unit for performing various displays for the operator.
[0028]
The image processing apparatus 30 performs image processing such as MTF (Modulation Transfer Function) correction, gradation correction, color correction, and image compression / decompression processing on actual image data input from the image input apparatus 20. Thus, the input actual image data is stored after the image processing as described above is performed. In the image processing apparatus 30, after all the actual image data has been input, the stored image data is output to the image output apparatus 40 a specified number of times in a specified order at a constant pitch.
[0029]
The image output device 40 includes a laser beam scanner 41, a xerographic engine 42, a paper transport mechanism 43, and an image output control unit 44 that controls the whole. Image data output from the image processing apparatus 30 is input to the laser beam scanner 41, and a laser beam for exposure is emitted along with the driving of the laser diode. In the xerographic engine 42 centering on the photoconductor 45, the exposed and developed visible image on the photoconductor 45 is transferred to a paper 46, which is passed through a fixing device 47 and discharged to a tray 48. The image output device 40 can output (print) images continuously at a constant pitch.
[0030]
FIG. 2 shows a block diagram of the image processing apparatus 30 according to the present embodiment. As shown in the figure, the image processing apparatus 30 according to the present embodiment includes an A / D converter (not shown) that converts actual image data input from the image input apparatus 20 into digital image data. An image processing unit (not shown) that performs necessary image processing such as gradation correction and color correction on the digital image data obtained by the converter, and compression and compression of the digital image data subjected to image processing by the image processing unit An image compression / decompression unit 31 for decompressing the digital image data, a memory buffer 32 for temporarily storing the digital image data, and processing such as sorting and sorting for the digital image data compressed by the image compression / decompression unit 31 Large-capacity hard disk 33 for sequentially storing digital image data in order to perform recording, and disk control for controlling the hard disk 33 34, the control unit (image input control unit 27, image output control unit 44) of another device, the serial input / output unit 35 that performs serial communication with the operation panel 26, and various control programs to execute the entire image processing device 30. A CPU (Central Processing Unit) 36 that controls the control, a ROM 37 that stores a control program executed by the CPU 36 and various parameters, a RAM 38 that is used as a work area when the control program is executed by the CPU 36, and the like. It consists of
[0031]
The RAM 38 in the present embodiment is configured as a so-called battery backup memory that is backed up by a battery (not shown), and retains the contents stored in the RAM 38 even when the main power supply of the digital copying machine 10 is turned off. Can do.
[0032]
As shown in FIG. 2, the image compression / decompression unit 31, memory buffer 32, disk control unit 34, serial input / output unit 35, CPU 36, ROM 37, and RAM 38 are connected to a common bus. The unit 31, the memory buffer 32, the disk control unit 34, the serial input / output unit 35, the ROM 37, and the RAM 38 are accessible.
[0033]
In addition, a vibration detection unit 39 connected to the CPU 36 is provided in the vicinity of the hard disk 33 of the image processing apparatus 30, and the CPU 36 can recognize the occurrence of vibration above a predetermined level in the vicinity of the hard disk 33.
[0034]
The vibration detection unit 39 detects vibration in the vicinity of the hard disk 33 and outputs an analog signal of a level corresponding to the magnitude of the vibration, and an analog signal output from the vibration sensor is used as a predetermined vibration detection threshold value. And an A / D converter (not shown) for converting into a digital signal (hereinafter referred to as a vibration detection signal).
[0035]
That is, in the vibration detection unit 39, as shown in FIG. 3, when vibration is generated near the hard disk 33 due to an external impact or the like, an analog signal corresponding to the magnitude of the vibration is generated by the vibration sensor included in the vibration detection unit 39. The analog signal is converted by the A / D converter included in the vibration detection unit 39 into a vibration detection signal (digital signal) having a pulse width that is equal to or greater than a predetermined vibration detection threshold and output. .
[0036]
In the present embodiment, the predetermined vibration detection threshold is set to a value slightly smaller than the value corresponding to the magnitude of vibration that may cause damage to the recording medium when it occurs during access to the hard disk 33. Therefore, when vibration of a level equal to or higher than the vibration detection threshold occurs during access to the hard disk 33, a vibration detection signal is output from the vibration detection unit 39. In this case, the recording medium of the hard disk 33 may be damaged. Indicates that there is.
[0037]
By the way, the minimum storage unit in the hard disk 33 is called one sector, and one sector is usually 512 bytes. However, since the image data is generally much larger than one sector, the management becomes complicated when managed in units of sectors, and the memory (RAM 38 in this embodiment) used as a work area in the management is complicated. Since it is necessary to increase the capacity, it is disadvantageous in terms of cost.
[0038]
Therefore, in the present embodiment, the hard disk is managed in units of blocks each of which is a group of a plurality of sectors, and a predetermined amount of image data is stored in the hard disk 33 repeatedly for each block. Image data is stored in the hard disk 33. In this embodiment, one block is 256 sectors (128 kbytes).
[0039]
FIG. 4 is a diagram showing a memory map of the RAM 38 described above. As shown in the figure, the RAM 38 includes a page information table T1, an error information table T2, and another area T3.
[0040]
In the page information table T1, information regarding image data of each page stored in the hard disk 33 is stored. Specifically, as shown in FIG. 5, the image size for each page, the head block address for indicating the storage position on the recording medium in the hard disk 33, and other necessary information are stored.
[0041]
On the other hand, as shown in FIG. 6, error information is stored in the error information table T2 for each block (# 0, # 1,..., #M) for a plurality of blocks of the hard disk 33. .
[0042]
In the error information in the present embodiment, vibration of a level equal to or higher than the above-described vibration detection threshold occurs in the vicinity of the hard disk 33 during writing of image data to the hard disk 33 or reading of image data from the hard disk 33. In this case, use prohibition information indicating that the storage area for each block of the hard disk 33 corresponding to the address accessed at the time of occurrence of the vibration is not used is included.
[0043]
Specifically, when vibration having a level equal to or higher than the vibration detection threshold described above occurs, “1” is set as the use prohibition information included in the error information corresponding to the block being accessed. In addition, when the device is shipped, “0” indicating use permission is initially set as use prohibition information included in error information corresponding to all blocks.
[0044]
The hard disk 33 corresponds to the disk device of the present invention, and the vibration detector 39 corresponds to the detection means of the present invention.
[0045]
Next, the basic operation of the image processing apparatus 30 according to the present embodiment will be described. First, the operation during image input will be described.
[0046]
First, image data of a document to be read is read page by page from the image input device 20 at a constant pitch, digitized by an A / D converter (not shown), and then necessary image processing is performed by an image processing unit (not shown). Applied.
[0047]
Thereafter, the image data subjected to the image processing is input to the image compression / decompression unit 31 and subjected to the compression processing, and the image data after the compression processing is sequentially stored in the memory buffer 32. At the same time, the image size is written in the page information table T1 of the RAM 38.
[0048]
Next, when the amount of image data stored in the memory buffer 32 reaches a predetermined amount, the image data stored in the memory buffer 32 is written to the hard disk 33 for each block (hereinafter referred to as “1-block writing”). This process is described later. At this time, every time image data for one page is stored in the hard disk 33, the head block address indicating the head position of the storage area on the recording medium in the hard disk 33 is recorded in the page information table T1 corresponding to the page. To do. If the size of each page of image data exceeds one block, the address of the used block is stored in the “other information” area of the page information table T1 corresponding to the page.
[0049]
Next, the operation at the time of image output will be described.
[0050]
First, a read process for each block of compressed image data from the hard disk 33 based on the image size of each page of the page information table T1, the head block address, and other information (hereinafter referred to as “one block read process”). This process is repeated, but this process will be described later.
[0051]
The image data read from the hard disk 33 for each block is transferred to the image compression / decompression unit 31, and after image decompression processing is performed, the decompressed image data is output to the image output device 40, and the image is printed out. .
[0052]
Next, a one-block writing process for writing image data for each block to the hard disk 33 will be described with reference to FIG. FIG. 7 is a flowchart showing the flow of a control program (hereinafter referred to as “one-block writing process program”) executed by the CPU 36 when executing the one-block writing process. The program is stored in the ROM 37 in advance. Yes.
[0053]
In step 200 in the figure, referring to the use prohibition information included in the error information table T2 of the RAM 38, a block number corresponding to the storage area on the recording medium of the hard disk 33 which is prohibited is obtained. In step 202, writing of image data to the storage area of the hard disk 33 corresponding to the block other than the block number acquired in step 200 is started by the disk control unit 34. In the next step 204, image data for one block is written. Waiting for completion of writing to the hard disk 33.
[0054]
Note that when a vibration detection signal is input from the vibration detection unit 39 to the CPU 36 during the processing of the above steps 202 and 204, that is, the processing of writing the image data for one block to the hard disk 33, a predetermined value is received. An interrupt process (hereinafter referred to as “vibration detection interrupt process 1”) is executed, which will be described later.
[0055]
When the writing of the image data for one block to the hard disk 33 is completed, that is, when the determination in step 204 is affirmed, the process proceeds to step 206 to check a status register (not shown) of the hard disk 33. In the next step 208, It is determined whether or not the check result in the above step 206 is normal. If the result is normal (when affirmative determination is made), the one-block writing process is terminated as it is, and if it is not normal (negative determination is made) In the case), after proceeding to step 210 and performing predetermined error processing, this one-block writing processing is terminated.
[0056]
Note that the processing from step 206 to step 210, that is, error processing based on the status register of the hard disk 33, is processing that is generally performed conventionally, and thus detailed description thereof is omitted here.
[0057]
Next, the vibration detection interrupt process 1 will be described with reference to FIG. FIG. 8 is a flowchart showing the flow of the vibration detection interrupt processing 1 program executed in the CPU 36, and this program is also stored in the ROM 37 in advance.
[0058]
In step 250 of the figure, the block address on the recording medium of the hard disk 33 that is being accessed is recognized at the present time, that is, when vibration of a level equal to or higher than a predetermined vibration detection threshold value is detected. '1' is set as use prohibition information in the error information table T2 corresponding to the block address recognized in step 250.
[0059]
In the next step 254, it is determined based on the presence / absence of the output of a vibration detection signal from the vibration detection unit 39 whether or not a vibration shock having a level equal to or higher than the vibration detection threshold value has been generated, and the vibration shock ends. Wait until.
[0060]
When the vibration shock ends, that is, when the determination in step 254 is negative, the process proceeds to step 256, and the image data that was being written to the storage area corresponding to the block other than the block address recognized in step 250 In the next step 258, the block address where the image data is written in step 256 is recorded in the “other information” area of the page information table T1, and then the vibration detection interrupt process 1 is terminated.
[0061]
When the image data stored in the memory buffer 32 is written to the hard disk 33 for each block and the image data of the block 3 is written by the vibration detection interrupt process 1 as shown in FIG. When vibration of a level equal to or higher than the vibration detection threshold occurs, the image data of the block 3 is also written in the storage area of the hard disk 33 corresponding to a different block after the vibration is finished. Therefore, it is possible to perform accurate image formation by using the image data written in another block in this way at the time of image output.
[0062]
Next, with reference to FIG. 10, a description will be given of one-block reading processing for reading image data for each block from the hard disk 33. FIG. FIG. 10 is a flowchart showing the flow of a control program (hereinafter referred to as “one-block read processing program”) executed by the CPU 36 when one-block read processing is performed. The program is also stored in the ROM 37 in advance. .
[0063]
In step 300 in the figure, use prohibition information included in the error information table T2 corresponding to the block to be read is acquired, and in the next step 302, reading of image data from the hard disk 33 is performed to the disk control unit 34. Let it begin. At this time, if the use prohibition information acquired in step 300 is “1”, the image data to be read is held in the storage area corresponding to another block of the hard disk 33 and is held. Since the block address is stored in the “other information” area of the page information table T1, the block address is acquired from the page information table T1, and the image data is read from the storage area corresponding to the address. .
[0064]
In the next step 304, the completion of reading of image data for one block from the hard disk 33 is waited for.
[0065]
Note that when a vibration detection signal is input from the vibration detection unit 39 to the CPU 36 during the processing of the above step 302 and step 304, that is, the processing of reading out image data for one block from the hard disk 33, a predetermined value is received. An interrupt process (hereinafter referred to as “vibration detection interrupt process 2”) is executed, which will be described later.
[0066]
When reading of image data for one block from the hard disk 33 is completed, that is, when the determination in step 304 is affirmed, the process proceeds to step 306 to check a status register (not shown) of the hard disk 33. In the next step 308, It is determined whether or not the check result in the above step 306 is normal. If the check result is normal (when an affirmative determination is made), the one-block reading process is terminated, and if not normal (a negative determination is made) In the case), the process proceeds to step 310 and a predetermined error process is performed, and then the one-block reading process is terminated.
[0067]
Note that the processing from step 306 to step 310, that is, error processing based on the status register of the hard disk 33 is processing that has been generally performed conventionally, and thus detailed description thereof is omitted here.
[0068]
Next, the vibration detection interrupt process 2 will be described with reference to FIG. FIG. 11 is a flowchart showing the flow of the vibration detection interrupt processing 2 program executed by the CPU 36, and the program is also stored in the ROM 37 in advance.
[0069]
In step 350 of the figure, the block address on the recording medium of the hard disk 33 that is being accessed is recognized at the present time, that is, when vibration of a level equal to or higher than a predetermined vibration detection threshold value is detected. '1' is set as use prohibition information in the error information table T2 corresponding to the block address recognized in step 350, and in the next step 354, the display included in the operation panel 26 provided in the image input device 20 is set. A warning indicating that there is a possibility that normal image data may not be obtained is displayed on the unit via the serial input / output unit 35.
[0070]
In the next step 356, the remaining image data that was being read at the time of the vibration is read out. In the next step 358, the read image data at the block address is stored in a different block address of the hard disk 33, and thereafter The vibration detection interrupt process 2 is terminated.
[0071]
Each process of step 252 in FIG. 8 and step 352 in FIG. 11 corresponds to the prohibition processing means of the present invention, and the process of step 256 in FIG. 8 corresponds to the holding means of the present invention.
[0072]
As described above in detail, in the image processing apparatus according to the first embodiment, when the vibration detection unit detects vibration at a level equal to or higher than the predetermined vibration detection threshold during access to the hard disk, the block being accessed Since processing for prohibiting subsequent use of the storage area corresponding to the address is performed, it is possible to prevent an increase in the number of access retries to the recording medium and the occurrence of a sudden inaccessible state.
[0073]
In the image processing apparatus according to the first embodiment, when the vibration detection unit detects vibration of a predetermined level or higher when image data is being written to the hard disk, the written image data is transferred to the hard disk after the vibration is stopped. Therefore, accurate image data can be obtained by reading the image data from the storage area corresponding to the different address when reading the image data.
[0074]
Furthermore, in the image processing apparatus according to the first embodiment, when the vibration detection unit detects vibrations of a predetermined level or more while reading image data from the hard disk, the read image data is continuously read. Therefore, if it is necessary to read the same image data again, an accurate image can be obtained by reading the image data from the storage area corresponding to the different address. Data may be available.
[0075]
In the first embodiment, the case where the image data being written is held in another block when vibration of a level equal to or higher than a predetermined vibration detection threshold occurs during the writing of the image data to the hard disk has been described. However, the present invention is not limited to this, and the writing operation of the image data may be stopped depending on the level of the generated vibration. In this embodiment, the pulse width of the vibration detection signal output from the vibration detection unit according to the present embodiment is a width corresponding to the magnitude of the vibration, so the pulse width of the vibration detection signal is larger than a predetermined value. This can be realized by stopping the writing operation of the image data.
[0076]
[Second Embodiment]
In the first embodiment, when vibration of a level equal to or higher than a predetermined vibration detection threshold is detected when writing image data to the hard disk 33, the image data being written is transferred to another block after the vibration is finished. In the second embodiment, the case where image data being written is held in the memory buffer 32 when vibration of a level equal to or higher than the vibration detection threshold is detected has been described. To do. The configuration of the digital copying machine according to the second embodiment is the same as that of the digital copying machine 10 according to the first embodiment, and a description thereof will be omitted here.
[0077]
In the image processing apparatus 30 according to the second embodiment, when a vibration having a level equal to or higher than the predetermined vibration detection threshold is detected during the writing of the image data to the hard disk 33 in the one-block writing process (see FIG. 7). The difference from the first embodiment is that the vibration detection interrupt process to be executed is the vibration detection interrupt process 1 'shown in FIG.
[0078]
That is, in step 250 of FIG. 12, the block address on the recording medium of the hard disk 33 that is being accessed is recognized at the present time, that is, when vibration of a level equal to or higher than a predetermined vibration detection threshold is detected. Then, '1' is set as the use prohibition information in the error information table T2 corresponding to the block address recognized in the above step 250, and then information indicating that the image data being written is left in the memory buffer 32 in step 260 After recording in the “other information” area of the information table T1, the vibration detection interrupt process 1 ′ is terminated.
[0079]
Therefore, in the image processing apparatus 30 according to the second embodiment, when the image data is written to the hard disk 33, the page information table T1 is referred to leave the image data in the memory buffer 32 in the “other information” area. When information is recorded, image data is not stored in the area of the memory buffer 32 in which the image data is stored.
[0080]
Further, when the image data is read from the hard disk 33 and the page information table T1 is referred to and information indicating that the image data remains in the memory buffer 32 is recorded in the “other information” area, the image data Are read from the memory buffer 32.
[0081]
The processing of step 260 in FIG. 12 corresponds to the holding means of the present invention, and the memory buffer 32 corresponds to the storage means of the present invention.
[0082]
As described above in detail, in the image processing apparatus according to the second embodiment, when the vibration detection unit detects vibration at a level equal to or higher than the predetermined vibration detection threshold during access to the hard disk, the block being accessed Since the processing for prohibiting the subsequent use of the storage area corresponding to the address is performed, the number of access retries to the recording medium is increased or the access is suddenly disabled as in the image processing apparatus according to the first embodiment. Occurrence can be prevented.
[0083]
In the image processing apparatus according to the second embodiment, when the vibration detection unit detects vibration of a predetermined level or more while writing image data to the hard disk, the written image data is held in the memory buffer. Therefore, accurate image data can be obtained by reading the image data from the memory buffer when reading the image data.
[0084]
In the second embodiment, the case where the image data being written is held in the memory buffer when the vibration having a level equal to or higher than the predetermined vibration detection threshold occurs during the writing of the image data to the hard disk has been described. However, the present invention is not limited to this, and the writing operation of the image data may be stopped depending on the level of the generated vibration. This form can be realized by stopping the image data writing operation when the pulse width of the vibration detection signal is larger than a predetermined value.
[0085]
In each of the above embodiments, the case where the error information table is recorded in the battery-backed RAM has been described. However, the present invention is not limited to this, and the error information table is recorded even when the main power is turned off. Any recording means capable of holding the contents can be recorded in any recording means, and as the recording means, for example, a flash memory, an EEPROM or the like can be applied.
[0086]
In each of the above embodiments, the case where the vibration detection unit as the detection means of the present invention is configured to include a vibration sensor and an A / D converter has been described, but the present invention is not limited to this. For example, it can also be set as the form comprised only with a vibration sensor. In this case, since the vibration detection signal output from the vibration detection unit is an analog signal, it is necessary to determine the magnitude of the vibration level based on the analog signal.
[0087]
In each of the above embodiments, a case has been described in which the read operation is continued when vibration having a level equal to or higher than a predetermined vibration detection threshold occurs during reading of image data from the hard disk. However, the present invention is not limited to this. For example, the read operation of the image data may be stopped depending on the level of vibration that has occurred. This form can be realized by stopping the image data reading operation when the pulse width of the vibration detection signal is larger than a predetermined value.
[0088]
【The invention's effect】
According to the present invention, when vibration of a predetermined level or more is detected during access to the disk device, subsequent use of the storage area corresponding to the address being accessed is prohibited, so that the recording medium is damaged by vibration. As a result, it is possible to prevent an increase in the number of times of retrying access to the recording medium and the occurrence of a sudden inaccessible state due to the above.
[Brief description of the drawings]
FIG. 1 is a schematic configuration diagram of a digital copying machine according to an embodiment.
2 is a block diagram illustrating an example of an internal configuration of the image processing apparatus in FIG. 1;
FIG. 3 is a waveform diagram for explaining the operation of the vibration detection unit in FIG. 2;
FIG. 4 is a schematic diagram showing a memory map of a RAM.
FIG. 5 is a schematic diagram showing the contents of a page information table T1.
FIG. 6 is a schematic diagram showing the contents of an error information table T2.
FIG. 7 is a flowchart showing the flow of a one-block write processing program.
FIG. 8 is a flowchart showing the flow of a vibration detection interrupt process 1 program executed when the 1-block write process program is executed.
FIG. 9 is a schematic diagram showing an example of a state of writing image data to a hard disk by executing a vibration detection interrupt process 1 program;
FIG. 10 is a flowchart showing the flow of a one-block read processing program.
FIG. 11 is a flowchart showing the flow of a vibration detection interrupt process 2 program executed when the 1-block read process program is executed.
FIG. 12 is a flowchart showing a flow of a vibration detection interrupt process 1 ′ program executed when the one-block write process program is executed.
[Explanation of symbols]
10 Digital copier
20 Image input device
30 Image processing device
32 Memory buffer (storage means)
33 Hard disk (disk device)
36 CPU
39 Vibration detector (detection means)

Claims (3)

In a disk control device that controls a disk device that stores information,
Detecting means for detecting vibration of the disk device;
Said disk writing of information to the device or, in the case where the detecting means during access for reading is detected vibrations above a predetermined level, the storage area corresponding to the address in the access, the access is a write of information If the access is reading information, if the access is reading information, perform processing to prohibit use after reading the remaining information, and when the access is reading information, read the rest of the information , Inhibiting processing means for storing in a storage means different from the disk device or storing the read information in a storage area corresponding to an address different from the address of the disk device after the vibration of the predetermined level or more is finished When,
A disk control device comprising:   2. The holding device according to claim 1, further comprising holding means for holding the written information when the detecting means detects a vibration of a predetermined level or more while writing information to the disk device. Disk controller. The holding means holds the written information by storing the information in a storage means different from the disk device, or the written information after the vibration of the predetermined level or more has ended. The disk controller according to claim 2, wherein the disk controller is held by storing it in a storage area corresponding to an address different from the address being accessed.

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