JPS61241850A - Memory control system of optical disk - Google Patents

Abstract

PURPOSE:To decrease the replacing frequency of storage control information to an optical disk and to improve the information storage efficiency of the optical disk, by replacing the storage control information stored in the optical disk only when the disk is ejected. CONSTITUTION:The directory information stored in an optical disk 1 is compared with that stored in a magnetic disk device 15 immediately before the disk 1 is ejected from an optical disk device 16. Then the directory information recorded to the disk 1 is rewritten only when the directory information of the device 15 is actually replaced. Thus the rewriting frequency of the directory information is decreased greatly compared with a case where the directory information of the disk 1 is rewritten every time the storage contents of the disk 1 are replaced. In this case, the directory information is collated and rewritten by defining all directory information recorded in the directory information recording area DR of the disk 1 as a single unit. In such a way, the retrieval processing is carried out easily at a higher speed.

Description

DETAILED DESCRIPTION OF THE INVENTION [Technical Field] The present invention relates to a storage management system for optical discs that allows highly reliable and efficient access to storage management information on optical discs.

[Prior Art] In recent years, optical disk devices using optical disks in which an optical storage medium is formed on a disk have been put into practical use, and are particularly applied to document filing devices or image data filing devices that handle large amounts of data. .

The surface of this optical disk has a track pitch of 1 to 2 μm.
A recording track (2) is formed, and data is recorded by changing the surface condition (for example, reflectance) of this recording track in accordance with the data to be recorded.

Furthermore, in many cases, optical discs are not rewritable and recorded data cannot be updated.

Generally, one file is stored in a continuous storage area on an optical disc, but in reality, the file is divided into sectors of a predetermined bit, and data is recorded in units of sectors. By recording data sector by sector in this way, the degree of freedom in accessing files is increased, and
Error correction processing for correcting data errors can be performed efficiently.

In order to efficiently access the data recorded in this way, file names and file search bases are provided.

Forms storage management information (directory information) consisting of the length of the file, the sector number 1J- (sector address) of the first sector that stores the file, the number of sectors occupied by the file, etc., and stores this storage management information. It is stored in a predetermined area of the optical disc.

By the way, as mentioned above, the optical disk itself cannot be rewritten, so if the storage management information on the optical disk is updated every time a file update process is executed, new Since the storage management information is stored on the optical disk, the proportion of the storage management information on the optical disk becomes extremely large, resulting in a disadvantage that the information storage efficiency of the optical disk decreases.

[Objective] The present invention was made in order to solve the problems of the prior art described above, and it is an object of the present invention to provide a storage management method for an optical disc that can improve the information storage efficiency of the optical disc.

[Structure] In order to achieve this object, the present invention provides a storage management information recording area for recording storage management information on an optical disc, and stores the storage management information in a temporary storage means when the optical disc is loaded. The management information is updated in this temporary storage means, and the storage management information stored on the optical disc is updated only when the optical disc is ejected.

Hereinafter, one embodiment of the present invention will be described in detail based on the accompanying drawings.

FIG. 1 shows an example of an optical disc 1. As shown in FIG.

As shown in the figure, an optical disk 1 is made of a donut-shaped optical storage material with a spindle hole 2 formed in its center, and its innermost portion is protected from the chucking mechanism of the drive unit NC (not shown). The innermost part of the storage area is set as the directory information recording area DR for storing directory information (storage management information) for managing stored information. The outside of the area is set as the data recording area DO.

That is, the data recording state of this optical disc 1 is
As shown in the figure, the directory information is at sector addresses 0-n, and the following sector address (n+1)
-N respectively store data. Note that N is the sector address of the final sector of the optical disc 1.

FIG. 3 shows a document file device according to an embodiment of the present invention.

In the same figure, a data processing bag [10] is a computer system for generating, processing, storing, updating, and discarding various data, and includes a keyboard 1 for inputting operation signals from an operator, and a screen for displaying various information. It includes a screen display device 12 for displaying images, a scanner 13 for reading document images to be filed, and a printer 14 for outputting document images, and further includes a magnetic disk device 15 as an auxiliary storage device.

An optical disk device 16 that stores documents in the form of images is connected to this data processing device 10. This optical disk device 16 includes an autochanger 18 that takes out and stores an arbitrary optical disk from a cabinet 17 that stores a large number of optical disks, and this autochanger 18 has a data processing bag w! 10.

In addition, a keyboard 111, a screen display device 12, a scanner 1
3. Since the printer 14 and the magnetic disk device 15 are well-known devices, detailed explanation thereof will be omitted.

In addition, this embodiment constitutes a so-called cabinet system in which one optical disk corresponds to one file cabinet (archive), and a different cabinet name is set by the operator for each optical disk L for each file cabinet. This cabinet name is stored in the directory information recording area OR of the optical disc 1. Also,
The data processing device 10 uses the optical disk 1 as directory information.

Create data as shown in the table below for each file.

With the above configuration, when a command to select the optical disc 1 is input from the keyboard 11, the data processing device w10 performs the following operations.

By executing the loading process shown in FIG. 4, the operator loads the optical disk 1 desired by the operator into the optical disk device 16.

That is, when the operator inputs the cabinet name from the keyboard 11 (input 101), it is determined whether or not the optical disk 1 has already been installed in the optical disk device i16 (102), and if the result of this judgment 102 is No, then The autochanger 18 takes out one optical disc 1 from the cabinet 17 and loads it into the optical disc device 16 (process 103).

As a result, when the optical disk 1 is loaded in the optical disk device 16, the cabinet name is read from the optical disk 1 and compared with the cabinet name input at input 101 (process 104).

If the results of this comparison do not match (the result of judgment 105 is No), the installed optical disk 1 is ejected (discharge process 106 (described later)), the process returns to process 103 and the next optical disk 1 is inserted into the optical disk device. Attach to 16 and process 10
3, 104, and judgment 105, the optical disk device 1 matches the input cabinet name.
Repeat until 6 is attached.

As a result, when the target optical disk l is loaded into the optical disk device 16, the data processing device 10 reads the directory information of the optical disk 1 from the directory information recording area DR, and reads out the directory information of the optical disk 1 from the magnetic disk device! 15 (processing 107).

When the data processing device 1O accesses the optical disk 1, it refers to the directory information stored in the magnetic disk device 15. Furthermore, when a process such as new file registration, deletion, or update of a file is executed on the optical disk 1, the directory information stored in the magnetic disk device 15 is similarly updated.

FIG. 5 shows an example of a file registration process on the optical disc 1, and FIG. 6 shows an example of a search process.

In the registration process, the image of the document set on the scanner 13 is read, and various image processing is performed on the read image as necessary to form one document file. , when identification information such as a file name and a search name is input, the data in the data recording area DD of the optical disk 1 obtained by referring to the length of the document file and the directory information stored in the magnetic disk device 15 is input. Based on the recording state and further on the date, directory information for the document file is formed.

Then, the image corresponding to the document file is transferred to the optical disk device 16 and registered on the optical disk 1, and the directory information stored in the magnetic disk device 15 is updated by adding the new directory information created at this time. .

In the search process, the directory information corresponding to the input search name is displayed on the screen! 12, and if this document is selected, the specified document file is read out from the optical disk l and outputted to the printer 14.

Note that since these registration search processes are not directly related to the present invention, detailed explanation thereof will be omitted. Furthermore, in order to improve the storage efficiency of the optical disc 1, the document image file is encoded and compressed using a predetermined method before being stored on the optical disc 1. Therefore, the information read from the optical disc 1 is restored to the original image by inverse conversion processing.

In this way, registration processing, search processing, deletion processing, etc. are performed on the optical disc 1 loaded in the optical disc device 16, and the operator removes the optical disc 1 from the optical disc device 16 for replacement or the like. When attempting to eject, the ejecting process as shown in FIG. 7 is performed6. Furthermore, this ejecting process is also executed by the process 106 in the mounting process shown in FIG.

That is, when there is a request to eject the optical disc 1.

The data processing device 10 first reads directory information from the optical disk 1 loaded in the optical disk device 16 and compares it with the directory information stored in the magnetic disk device 15 (process 110).

If the optical disc 1 installed at this time is only searched, or if an optical disc 1 other than the target one is ejected in the loading process shown in FIG. is YES), the autochanger 18 is activated and the optical disk device 16 is activated.
The optical disc 1 loaded in the cabinet 17 is ejected and stored in the corresponding storage position of the cabinet 17 (process 112).

Also, if a new document file is registered or updated on the optical disc 1 installed at this time, 1
The result of decision 111 is NO, therefore, the data processing device! At this time, after setting the directory information stored in the optical disk 1 to a deleted state, 10 records the directory information stored in the magnetic disk device 15 anew in the directory recording area DR of the optical disk 1, and stores it in the optical disk l. Process 113) to update the directory information to be stored, and then proceed to process 112 to eject the optical disc 1 from the optical disc device 16 and place it in the cabinet 1.
Store it in 7.

In this way, the optical disc l can be converted into an optical disc family! ! 16
Immediately before ejecting the optical disc 1, the directory information stored on the optical disc 1 is compared with the directory information stored in the magnetic disc device 15, and the information is recorded on the optical disc 1 only when this directory information has actually been updated. Since the directory information stored in the optical disc 1 is rewritten, the frequency of rewriting the directory information is much lower than in the case where the directory information on the optical disc 1 is rewritten every time the stored contents of the optical disc 1 are updated.

Note that the collation and rewriting of the directory information in this case is performed using all the directory information recorded in the directory information recording area DR of the optical disc 1 as one unit. In this way, the area in which directory information is recorded is always continuous, making search processing easier and faster.

By the way, in the above embodiment, the directory information shown in the table above is used, but the contents are not limited to this. In particular, providing multiple search names makes it easier to search for document files. do.

[Effects] As explained above, according to the present invention, a storage management information recording area for recording storage management information is provided on an optical disc, and when the optical disc is loaded, the storage management information is temporarily stored in the storage means, and the storage management information is stored in the storage means. The management information is updated in this temporary storage means, and the storage management information stored on the optical disc is updated only when the optical disc is ejected. Therefore, the frequency of updating the storage management information for the optical disc can be suppressed, and the As a result, there is an advantage that the information storage efficiency of the optical disc can be improved.

[Brief explanation of the drawing]

FIG. 1 is a plan view illustrating an optical disc according to an embodiment of the present invention, FIG. 2 is a schematic diagram illustrating a storage area setting situation on the optical disc, and FIG. 3 is a document file according to an embodiment of the present invention. FIG. 4 is a block diagram showing an apparatus; FIG. 4 is a flowchart showing an example of an optical disc loading process; and FIG. 5 is a flowchart showing an example of a document file registration process. FIG. 6 is a flowchart showing an example of document file search processing, and FIG. 7 is a flowchart showing an example of optical disc ejection processing. DESCRIPTION OF SYMBOLS 1... Optical disk, 10... Data processing device, magnetic disk device, 16... Optical disk device, 17...
・Cabinet, 18...Auto changer. Figure 7 Figure 2 Figure 3 Figure 4 Figure 5 Figure 6 Figure 7

Claims (1)

[Claims] The optical disc is provided with a storage management information recording area for recording storage management information, and also includes a mounting/detaching means for mounting/detaching the optical disc, and a temporary storage means for temporarily storing the storage management information, and the optical disc is mounted by the mounting/detaching means. and reading the storage management information into the temporary storage means,
The storage management information is updated on the temporary storage means, and when the optical disc is ejected by the attachment/detachment means, the storage management information stored in the temporary storage means and the optical disc are updated at this point. A storage management method for an optical disc, characterized in that when the storage management information is different, the storage management information stored in the optical disc is updated with the storage management information stored in the temporary storage means.