JP2652388B2 - Optical disk storage management method - Google Patents

Description

Description: TECHNICAL FIELD The present invention relates to a storage management method for an optical disk.

[Prior Art] In recent years, mounting of an optical disk using an optical disk in which an optical storage medium is formed in a disk shape as a storage medium has been put into practical use, and an image data filing apparatus for handling a large amount of data, or a large-capacity storage in an electronic computer system. It is applied to auxiliary storage devices and the like.

The track pitch is 1-2 on the surface of this optical disc.
A recording track of μm is formed, and data is recorded by changing the state of the surface of the recording track (for example, the reflectance) in accordance with the data to be recorded. In many cases, when recording data, the surface of the recording track is destroyed, so that the recording data cannot be updated on the same recording track.

On the optical disk, data is recorded / reproduced in sector units of a predetermined length, and a data file is divided into sector units and is usually stored in continuous sectors. By recording data in sector units in this way,
The degree of freedom in accessing a file is increased, and an error correction process for correcting a data error can be efficiently performed.

In order to access the recorded data efficiently, a file name for identifying the file, search information necessary for searching the file, a sector number of a plurality of sectors storing the file (sector address) ) Is formed as storage management information (directory information). The information included in the storage management information is appropriately set by an operating system in a system using the optical disk device, an application program for file management, and the like.

By the way, as described above, since rewriting cannot be performed on an optical disk, storage management information that needs to be frequently rewritten is conventionally stored in a rewritable storage device other than an optical disk, for example, a fixed magnetic disk device or a flexible magnetic disk device. It was stored in a magnetic disk (flexible disk) device or the like.

When the optical disk is ejected from the optical disk drive, the storage management information is registered in the optical disk.

However, in such a conventional apparatus, when the system loses power while using the optical disc, the storage management information registered in the optical disc becomes incomplete,
Since then, there has been an inconvenience that the storage data of the optical disk cannot be properly accessed.

[Purpose] The present invention has been made in order to solve the inconvenience of the related art, and in the case where storage management information registered in an optical disk is incomplete, an optical disk which can restore the storage management information to a complete one. It aims to provide a memory management method.

[Configuration] According to the present invention, the storage management information registered in another nonvolatile storage device is erased when the registration to the optical disk is completed normally, and is the latest storage management information at that time. If the registration identification mark for identifying the storage management information is included in the storage management information, and the optical disk drive is mounted on the optical disk drive and the registration identification mark of the latest storage management information is not up to date, the nonvolatile storage device The storage management information registered in the optical disk is restored based on the storage management information registered in the optical disk.

Hereinafter, embodiments of the present invention will be described in detail with reference to the accompanying drawings.

FIG. 1 shows an optical disk system according to one embodiment of the present invention.

In FIG. 1, a system control unit 1 controls the entire optical disc system and performs an editing process of an image read by the scanner 2, various image processes, and an image compression process.

The scanner 2 is for reading an image to be registered on the optical disc at a predetermined resolution, and the image buffer 3 is
It forms a work area or the like when editing an image.

The optical disc device 4 records / records data on the optical disc 5.
The magnetic disk device 6 is for reproducing, and is for storing a failure recovery file including directory information (management information) indicating a recording state of a disk file on the optical disk 5.

The operation display device 7 is used by an operator to perform various operation inputs for using the optical disk system and to display a processing result. The operation display device 7 is also used for interacting with an operating system executed by the system control unit 1, an application program for file management, and the like.

Here, such an optical disk system is, for example,
It is installed and used at the same business establishment,
Therefore, the optical disk 5 may be transferred to another optical disk system for use. In such a case, the management information stored in the magnetic disk device 6 is appropriately recorded on the optical disk 5, and the other optical disk The system can also be used.

FIG. 2A shows the state of allocation of storage areas on the optical disc 5.

The head of the storage area of the optical disk 5 is
Is set in the volume label area LV in which a volume name or the like for identifying the
These are sequentially set in the management information area MR and the data file area DR.

Image data and the like are stored in the data file area DR, and the data file area DR is stored in the management information area MR.
And management information (directory information) for efficiently accessing the data file stored in the storage area.

The recording track formed on the optical disk 5 for recording / reproducing data is divided into sectors of a predetermined length as shown in FIG. One sector includes a synchronization signal S for synchronizing the reading system of the recording / reproducing head, a sector address A for identifying each sector, and data DT of a predetermined length. The storage / reproduction of information on the optical disk 5 is performed on a sector-by-sector basis.

An example of management information stored in the management information area MR is shown in FIG.

The management information FM includes an identification mark IDM for identifying whether or not the management information FM is the latest management information when transferred from the magnetic disk device 6 to the optical disk 5, and file identification information for identifying each data file. FIF, and
It consists of file map information FMP indicating the storage state of the data file in the data file area DR.

The specific contents of the management information FM are appropriately set by an operating system executed by the system control unit 1 and an application program for file management, and may include search information for searching for a file. .

As shown in FIG. 3 (a), the magnetic disk device 6 stores failure recovery files FRC1 to FRCl corresponding to each optical disk 5 and a directory buffer DRB. The magnetic disk device 6 also stores various other information required by the system.

The failure recovery file FRC, as shown in FIG.
The name of the volume added to the optical disk 5 and the management information FM newly formed by the system control unit 1 in a time-series manner between the time when the optical disk 5 is mounted on the optical disk device 4 and the time when the optical disk 5 is ejected. It is made.

The directory buffer DRB has a size of one sector, which is the minimum recording unit of the optical disk 5, as shown in FIG. 4C, and the system control unit controls the optical disk 5 mounted on the optical disk device 4 at that time. 1 temporarily stores the management information FM newly formed in time series.

Then, the system control unit 1 accumulates, for example, m pieces of newly formed management information FM and stores them in the directory buffer DR.
When B becomes full, the management information FM stored in the directory buffer DRB is sequentially stored from the head of the empty area of the management information area MR of the optical disk 5, and then the contents of the directory buffer DRB are cleared.

When the optical disk 5 is ejected from the optical disk device 4, the system control unit 1 stores all the management information FM remaining in the directory buffer DRB at that time from the beginning of the empty area of the management information area MR of the optical disk 5. Then, the contents of the directory buffer DRB are cleared, and when the storage is normally completed, the failure recovery file FRC corresponding to the optical disk 5 is deleted.

When storing the management information FM of the magnetic disk device 6 on the optical disk 5 in this way, the system control unit 1 manages the management information FM at the time when the optical disk 5 is ejected.
For the latest one, "1" is added to its identification mark IDM.
Set the IDM for the rest
Is set to “0”.

Therefore, for example, when the optical disk 5 is ejected from the optical disk device 4, all the management information is stored on the optical disk 5.
When the FM has been properly stored, the value of the identification mark IDM (IDM9) of the management information FM stored immediately before the empty area of the management information area MR is "1" as shown in FIG. "become.

On the other hand, for example, when the power is cut off while the management information FM is being stored on the optical disk 5 and all the management information FM cannot be properly stored on the optical disk 5, FIG. As shown in the figure, the identification mark IDM (IDM8) of the management information FM stored immediately before the empty area of the management information area MR
Becomes “0”.

Thus, the system control unit 1 can determine whether the management information FM stored on the optical disk 5 is appropriate.

Further, the failure recovery file FRC stored in the magnetic disk device 6 is deleted from the magnetic disk device 6 only when the management information FM is completely stored in the optical disk 5 when the optical disk 5 is ejected. For example, when the power is turned off while the management information FM is being stored in the optical disk 5 as described above, it remains in the magnetic disk device 6.

Therefore, the system control unit 1 refers to the failure recovery file FRC remaining in the magnetic disk device 6 having the same volume name as the target optical disk 5 and stores the failure recovery file FRC in the optical disk 5. The management information FM can be restored to a complete one.

With the above configuration, when the optical disk 5 is mounted on the optical disk device 4, the system control unit 1 executes the processing shown in FIG.
Is determined to be appropriate, and if not, the contents are restored by referring to the failure recovery file FRC remaining in the magnetic disk device 6.

That is, first, the volume name of the set optical disk 5 is read, and it is checked whether a failure recovery file FRC having the same volume name is stored in the magnetic disk device 6 (decision 101).

If the result of the determination 101 is YES, since the normal management information FM is not stored in the set optical disk 5, the contents of the management information area MR of the optical disk 5 are determined based on the contents of the failure recovery file FRC. To recover (Process 10
2). Then, the contents of the failure recovery file FRC are cleared, and the process proceeds to the next processing.

If the result of the determination 101 is NO, the failure recovery file FRC having the volume name of the set optical disk 5
Is newly generated in the magnetic disk device 6 (process 103), and the management information immediately before the empty area of the management information area MR of the optical disk 5 is generated.
It is checked whether or not the FM identification mark IDM is set to "1" (decision 104).

When the result of this determination 104 is YES, since the appropriate management information FM is stored in the optical disk 5, a registration start process 105 for reading out all the management information FM and expanding the same in the magnetic disk device 6 is executed. The registration start process 105 includes a process of initializing the internal states of the system and the system processing unit 1 so that the optical disk 5 can be used.

When the result of the determination 104 is NO, the optical disk 5 has failed when it is being used by another optical disk system, and the failure cannot be recovered by this optical disk system. The operator is notified from the operation display device 7 (processing 10
6).

Thus, when using the optical disk 5,
Since the operation is performed after the management information area MR of the optical disk 5 is restored to an appropriate state, the optical disk 5 can be properly accessed even if a failure has occurred while using the optical disk 5 last time.

Thereafter, each time the content of the optical disk 5 is updated by accessing the optical disk 5, the management information FM is newly generated in the magnetic disk device 6 and, as described above, the management information FM is stored in the failure recovery file FRC in chronological order. And temporarily stored in the directory buffer DRB, and then stored on the optical disk 5.

When the optical disk 5 is ejected, the management information FM stored in the directory buffer DRB is stored in the optical disk 5 and the identification mark IDM of the latest management information FM is set to "1" as described above. You. Further, the identification marks IDM of the other management information FM are set to “0” as described above.

The other operation of the optical disk system is not directly related to the present invention, and thus the description is omitted.

As described above, according to the present embodiment, even if a failure such as a power failure occurs during use, the contents of the management information stored on the optical disk can be restored to an appropriate state. Appropriate access.

In the above-described embodiment, the present invention is applied to the optical disk system of the embodiment shown in FIG. 1. However, the present invention can be applied to an optical disk system having other configurations.

[Effects] As described above, according to the present invention, the storage management information registered in another nonvolatile storage device is deleted when the registration to the optical disk is completed normally, and the storage management information at that time is deleted. A registration identification mark for identifying the latest storage management information is included in the storage management information, and when the optical disk is mounted on the optical disk drive, the registration identification mark of the latest storage management information is not updated. In such a case, since the storage management information registered on the optical disk is restored based on the storage management information registered on the nonvolatile storage device, the storage management information registered on the optical disk is incomplete. In such a case, the storage management information can be completely restored, and thereafter, the optical disk can be appropriately accessed.

[Brief description of the drawings]

FIG. 1 is a block diagram showing an optical disk system according to an embodiment of the present invention, FIG. 2 (a) is a signal arrangement diagram showing an example of allocating storage areas of the optical disk, and FIG. 1 (b) is an example of a sector configuration. FIG. 3 (c) is a signal layout diagram illustrating an example of management information, FIG. 3 (a) is a signal layout diagram illustrating a part of the storage contents of the magnetic disk drive, and FIG. 3 (b) is a fault FIG. 4C is a signal layout diagram showing an example of a restoration file, FIG. 4C is a signal layout diagram showing an example of a directory buffer, and FIG.
Is a schematic diagram illustrating an identification mark in a normal case, FIG. 4E is a schematic diagram illustrating an identification mark when a failure occurs, and FIG. 4 is a flowchart illustrating a processing example of a system control unit.

Claims (1)

(57) [Claims] 1. An optical disk storage management information formed during a period from the loading of an optical disk to an optical disk drive until the optical disk is ejected is stored in another nonvolatile storage device, and the information is stored in the nonvolatile storage device when the optical disk is ejected. The stored storage management information is registered in the storage management information area of the optical disk, and when the registration is normally completed, the storage management information stored in the nonvolatile storage device is deleted, and the storage management information is The storage management information includes a registration identification mark for identifying whether or not the storage management information is the latest one at the time of ejection of the optical disk. When the optical disk is mounted on the optical disk drive, the latest registration information is stored in the storage management information area of the optical disk. When the above-mentioned registration identification mark of the storage management information is not set to the latest state, the storage tube stored on the optical disc is When it is determined that the information has a defect and the storage management information is stored in the nonvolatile storage device, the storage management information stored on the optical disk is restored with the contents of the storage management information. Storage management method for optical disks