WO2002061568A1 - Unite de mise en memoire de l'information - Google Patents

Unite de mise en memoire de l'information Download PDF

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Publication number
WO2002061568A1
WO2002061568A1 PCT/JP2002/000614 JP0200614W WO02061568A1 WO 2002061568 A1 WO2002061568 A1 WO 2002061568A1 JP 0200614 W JP0200614 W JP 0200614W WO 02061568 A1 WO02061568 A1 WO 02061568A1
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WO
WIPO (PCT)
Prior art keywords
data
area
magneto
information storage
recording
Prior art date
Application number
PCT/JP2002/000614
Other languages
English (en)
Japanese (ja)
Inventor
Masahiko Tomikawa
Original Assignee
Sanyo Electric Co., Ltd.
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Sanyo Electric Co., Ltd. filed Critical Sanyo Electric Co., Ltd.
Priority to JP2002561673A priority Critical patent/JPWO2002061568A1/ja
Publication of WO2002061568A1 publication Critical patent/WO2002061568A1/fr

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Classifications

    • G—PHYSICS
    • G11—INFORMATION STORAGE
    • G11B—INFORMATION STORAGE BASED ON RELATIVE MOVEMENT BETWEEN RECORD CARRIER AND TRANSDUCER
    • G11B20/00—Signal processing not specific to the method of recording or reproducing; Circuits therefor
    • G11B20/10—Digital recording or reproducing
    • G11B20/12—Formatting, e.g. arrangement of data block or words on the record carriers
    • G11B20/1217—Formatting, e.g. arrangement of data block or words on the record carriers on discs

Definitions

  • the present invention relates to an information storage device, and more particularly to an information storage device used for a digital camera for storing image information such as a still image.
  • a semiconductor memory As a recording device of a digital camera that mainly records a still image, a semiconductor memory, a hard disk, a magneto-optical disk, and the like are used.
  • Semiconductor memories have the disadvantage that they have a relatively small recording capacity, and with the shift in functions from digital still images to moving image recording in digital cameras, small and large-capacity recording devices are desired. Therefore, it is planned to use a recording medium such as a hard disk, a magneto-optical disk, and a DVD disk as a recording device of a digital camera, and research and development are being conducted.
  • Such a recording medium requires processing different from conventional semiconductor memory.
  • Japanese Patent Application Laid-Open No. Hei 8-767693 provides two format operations, a simple format that does not detect a bad sector and a standard format that detects a bad sector, and consequently hasten the start of a recording operation. There are disclosures about digital cameras that can.
  • the device must be configured so that a read error does not occur when a read request is issued from a personal computer.
  • an information storage device using a magneto-optical disk in response to an external data read request, if the magneto-optical disk is in an unused state, data of a predetermined format is read. It will be returned as a night. Therefore, means for determining whether or not the area of the magneto-optical disk corresponding to the read request is unused, and forming data in a predetermined format when unused, and outputting the data as read data It is provided with means for performing.
  • the means for determining whether or not the data is unused is a means for detecting whether or not the data obtained by the reading process has a predetermined format.
  • FIG. 1 is a schematic block diagram showing one embodiment of the present invention.
  • FIG. 2 is a flowchart illustrating an initialization process according to the embodiment.
  • FIG. 3 is a flowchart showing a reading process according to the embodiment.
  • FIG. 4 is a flowchart illustrating a write process according to the embodiment.
  • FIG. 5 is a plan view showing a magneto-optical disk.
  • FIG. 6 is a schematic diagram showing an outline of the ECC block.
  • FIG. 7 is a schematic diagram showing lower bits of 'ID data.
  • FIG. 8 is a flowchart showing an algorithm for determining whether each block is unused.
  • FIG. 1 is a block diagram showing the relationship between the main parts of a digital camera and a personal computer.
  • the camera unit 1 is a block that performs predetermined processing on the video signal from the CCD
  • the CPU 2 is a microcomputer that controls the operation of the camera unit 1 and the magneto-optical drive 3
  • the magneto-optical drive 3 is This block records and reproduces predetermined information with respect to the magneto-optical disk 4.
  • Reference numeral 5 denotes an interface section of IEEE 1394, which mediates data transmission and command transmission between the magneto-optical drive 3 and the personal computer 6.
  • Reference numeral 7 denotes a display of the digital camera, which performs various displays for operating the camera. As will be described later, when the recording of a moving image cannot be continued due to a defect in the magneto-optical disk, an indication to that effect is displayed.
  • the display 7 has a menu display for controlling the camera, a playback display of recorded still images and moving images, and a viewfinder function for shooting.
  • Reference numeral 8 denotes a memory, which is used for CPU work. For example, it is used for the purpose of reading information about a defective area of the magneto-optical disk 4 described later from the magneto-optical disk and temporarily storing the information.
  • the photographing operation of the digital camera is as follows.
  • the image information accumulated by the shutter operation is signal-processed in the camera unit 1 and recorded in the magneto-optical drive 3 based on the control of the CPU 2.
  • the image information recorded on the magneto-optical disk 4 is read out under the control of the CPU 2, displayed on the display ⁇ , or transmitted to the personal computer 6 via the interface 5.
  • FIG. 5 is a front view showing the magneto-optical disk 4.
  • the area 51 inside the figure is a disk defect management area, and the area 52 outside the disk defect management area is a disk drive actually used by the user. Is recorded.
  • the magneto-optical disk 4 is logically divided into unit areas called sectors in order to use it efficiently, and it is possible to perform recording or reproduction by designating a desired sector by a predetermined addressing method. it can.
  • individual sectors may be defective during the manufacturing process, recording and reproduction may not be possible. Such sectors need to be identified and managed so that they will not be used for future recording and playback. It is.
  • the Disk Defect Management Area DMA
  • the recording / reproducing process can be performed by checking the DMA 51 without recording / reproducing in the defective area.
  • One method is to detect defective areas by certifying the disk before using the magneto-optical disk for the first time. This is the first defect management method. According to this method, the address of the detected defective area is recorded in the DMA area and is not used thereafter.
  • the second method is mainly to manage the defective area found after the certification, and writes the data to the magneto-optical disk, reads the written data, and checks the correctness of the data.
  • a method of registering a defect area and an alternative area (second defect management method).
  • the defect information is temporarily recorded in the memory 8 of the main body, and is written to the DMA area of the disk 4 as needed.
  • the first management method is a method performed by a certificate operation, so it takes a long time to perform the process. Therefore, information recording such as the present invention is
  • defect management can be performed only by the second management method. This is the reason why this unit can be used even on discs that have not been certified.
  • the certification some data is written to the entire user area of the disk. In this case, even if there is a data read request for the user area, the data is written. Can be read. However, this is not guaranteed for uncertified discs.
  • the data unit for reading and writing in the magneto-optical drive 3 is in units of error correction blocks.
  • recording and reproduction in the magneto-optical drive 3 are performed in units of 32 kilobytes, but externally, control can be performed so that writing and reading can be performed in units of 2 kilobytes apparently. In other words, the difference in the processing unit must be absorbed by the processing via the server.
  • step 20 when the magneto-optical disk is installed in the magneto-optical drive and the power is turned on (step 20), first, in the magneto-optical drive 3, the pickup laser Adjust the power and initialize other circuits (step 21). Then, the data of the DMA is read first (step 22). Then, the data of the DMA is checked to check whether data is recorded in the DMA (whether the DMA is in an unused state) (step 23). The checking method will be described later. Since the fact that no data is recorded in the DMA means that the disc is an unused disc, write data indicating that there is no defect in order to perform the subsequent processing without delay ( Step 24). When normal data is recorded in the DMA, the process proceeds to the next process (for example, the process in FIG. 3).
  • FIG. 3 is a flowchart showing processing of the read command.
  • the system enters a command waiting state (step 31). For example, when a command is given from the personal computer 6 through the interface 5, it is checked whether the command is a read command for data read from the disk (step 32). If it is not a read command, processing of another command, for example, a write command (described in FIG. 4) is performed in step 33, and the process returns to the command waiting state. If it is a read command, the data in the designated area (logical address) is read from the disk and temporarily stored in a predetermined buffer (step 34). By checking the contents of the buffer, it is checked whether the specified disk area is an unused area (step 35).
  • a command waiting state For example, when a command is given from the personal computer 6 through the interface 5, it is checked whether the command is a read command for data read from the disk (step 32). If it is not a read command, processing of another command, for example, a write command (described in FIG. 4) is performed in
  • step 36 sets the read size to zero of a designated size, that is, data of a predetermined format in a read buffer, and then to the next step. If it is not an unused area, the data read out as it is can be used, and the process proceeds to the next step 37.
  • step 37 the data set in the read buffer is transmitted as a reproduction data to the device that has requested the data read, for example, a personal computer. By this processing, data in a predetermined format is returned to the personal computer 6 even when the disc is an unused disc or when the designated area of the disc is unused.
  • the magneto-optical drive 3 when used as a general-purpose storage device for a computer via an interface such as IEEE1394, ATA, or SCSI, there is no possibility that the computer will determine that the drive is malfunctioning.
  • Various OSs can be considered for the convenience of using the magneto-optical drive 3, and since there are various file systems, the actual status of commands for the magneto-optical drive cannot be predicted, but the above measures will solve the problem.
  • FIG. 4 is a flowchart showing the write operation.
  • the command is initially in a command waiting state, and if it is a command other than a write command, it returns to the command waiting state via step 43.
  • a write command is accompanied by an amount in units of 2 kilobytes to be written (n times 2 kilobytes: n is a positive integer) and the logical address of the write destination, and the command is a write command.
  • calligraphy The data of 2 kilobytes to be written is stored in the predetermined buffer 1 on the memory 8 (step 44).
  • the data unit of writing and reading in the magneto-optical drive is 32 kilobytes, which is larger than 2 kilobytes, the data in the buffer 1 cannot be recorded as it is. Therefore, the data of the ECC block including the logical address to be written is first read from the magneto-optical disk 4 and stored in the buffer 2 on the memory 8 (step 45). Then, in step 46, the read data of the ECC work is checked to check whether or not the data is an unused area (step 46). The check method will be described later.
  • step 47 the contents of the buffer 2 are all set to zero, and the process proceeds to the next step 48.
  • step 48 the data corresponding to the logical address specified by the write command is overwritten with the write data of the buffer 1, and then the whole ECC block is written to the magneto-optical disk. Then, after completing the write command processing, it will be a verge.
  • ECC programs which are units of error correction.
  • the ECC block is further divided into a plurality of blocks, for example, 16 blocks, and each block includes data ID indicating the type of the logical address and the like of the block.
  • This data ID 65 has a size of 4 bytes and is as shown in FIG.
  • a data filter 66 is provided in the block to detect the error. Then, using two of the data ID 65 and the error detection data 66, it can be detected whether or not the data ID of the program is incorrect. There is a well-known method for the details of the error detection and the method of detection, so the description is omitted.
  • ID data 65 also includes the logical address of the block, it depends on the implementation, but the logical addresses should be in a predetermined order.
  • the four least significant bits of the ID data are arranged in order from “0000” to “111” as shown in FIG.
  • ID data 6 5 also includes data representing the attributes of the block.
  • the algorithm for determining whether each block is unused is shown in FIG.
  • the data ID 65 of the 16 blocks and the corresponding error detection data 66 in the read ECC block are checked for correctness of each data ID. When it is detected that all data IDs are erroneous, it is determined that the area is an unused area (step 82). If some of the ID data are correct, proceed to the next step 83 to determine whether the order of the lower 4 bits of the ID data is correct in the ID data determined to be correct. Is checked, and if all of the ID data determined to be correct are incorrect, it is determined that the area is unused. If there is at least one block in the correct order, proceed to the next step 84 and check the attribute data of the block. And the ID that was determined to be correct
  • the attribute data of all the data is not normally the scheduled data, it is determined to be an unused area. In other words, if at least one of the above three conditions is satisfied, the ECC block is determined as an unused area.
  • the unused area can be reliably determined, and there is no possibility that the used area is erroneously determined as the unused area.
  • the above-described magneto-optical recording / reproducing apparatus is used for a digital camera. Still images and moving images can be considered as recording targets of a digital camera. Generally, since the amount of data of a moving image is larger than that of a still image, the transmission rate of a recording / reproducing apparatus required for recording a moving image having a large screen size becomes extremely large. On the other hand, since it is difficult to manufacture a defect-free magneto-optical disk, a magneto-optical disk used in a magneto-optical recording / reproducing apparatus often includes some defective area.
  • the first defect management method described above is based on the premise that the disk is to be certified, and the certification is time-consuming.
  • the magneto-optical recording / reproducing apparatus of the present embodiment the certification of the magneto-optical disk is not required. In other words, a magneto-optical disk that has not been certified can be used.
  • the DMA area of the magneto-optical disk is also provided with an area for storing the number of defective sectors by the second defect management, so that the number of defective areas can be determined.
  • the use of the second defect management method inevitably results in the assignment of an alternative area to the magneto-optical disk in which the recording / reproducing pickup must be moved (seeked). I will. If the number of assignments increases, the apparent transfer rate of the recording operation will decrease when attempting to record a large amount of data continuously (for example, when recording a moving image), and the recording operation There is a risk of stopping. Therefore, in the present embodiment, when the number of defective areas exceeds a predetermined number, processing that requires high-speed operation, for example, recording of a moving image is prohibited. Specifically, the number of defective areas of the magneto-optical disk is recorded in the memory 8 used by the CPU 2, and if this number exceeds a predetermined number, the CPU flag is set.
  • a predetermined message is displayed on the display 7 so as not to accept the request. This prevents the user from interrupting the recording operation halfway, such as by using another disk.
  • a display notifying that the magneto-optical disk has been replaced may be displayed on the display 7.
  • an external data request such as a personal computer
  • data in a predetermined format is returned, so that an appropriate response can be made to a request from a personal computer.

Abstract

L'invention concerne une unité de mise en mémoire de l'information, à utiliser dans une caméra numérique, dans laquelle une demande d'un ordinateur personnel peut être traitée de manière appropriée lorsque ladite unité est connectée à un ordinateur personnel. Dans une unité de mise en mémoire de l'information utilisant un disque magnéto-optique, les données de format prédéterminé sont renvoyées en tant que données lues si le disque magnéto-optique est inutilisé pour une demande de lecture de données externe. L'unité de mise en mémoire de l'information comprend un moyen permettant de déterminer si la zone du disque magnéto-optique correspondant à la demande de lecture est utilisée ou pas, et un moyen pour former des données d'un format spécifié si ladite zone n'est toujours pas utilisée et pour produire en sortie des données de lecture.
PCT/JP2002/000614 2001-01-29 2002-01-28 Unite de mise en memoire de l'information WO2002061568A1 (fr)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP2002561673A JPWO2002061568A1 (ja) 2001-01-29 2002-01-28 情報記憶装置

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
JP2001019706 2001-01-29
JP2001-19706 2001-01-29

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WO2002061568A1 true WO2002061568A1 (fr) 2002-08-08

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Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH11149718A (ja) * 1997-11-18 1999-06-02 Sony Corp ディスク記録領域管理装置
EP0997904A1 (fr) * 1998-10-22 2000-05-03 Matsushita Electric Industrial Co., Ltd. Support d'enregistrement d'information, et méthode et appareil de gestion de défauts associés
JP2000311066A (ja) * 1999-04-27 2000-11-07 Aplix Corp エミュレートシステムおよび方法

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH11149718A (ja) * 1997-11-18 1999-06-02 Sony Corp ディスク記録領域管理装置
EP0997904A1 (fr) * 1998-10-22 2000-05-03 Matsushita Electric Industrial Co., Ltd. Support d'enregistrement d'information, et méthode et appareil de gestion de défauts associés
JP2000311066A (ja) * 1999-04-27 2000-11-07 Aplix Corp エミュレートシステムおよび方法

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