JPH01248384A - Method for managing storage of optical disk - Google Patents

Abstract

PURPOSE:To improve the storing efficiency of an optical disk and to simplify the processing of storage managing information by performing the update of the content of the same data file in an area corresponding to null area information, and updating the null area information at every updating. CONSTITUTION:The sector length of a storage managing storage area MR is set smaller than that of a data storage area DR, and also, the storage managing information is constituted of the identification information of a targeted data file, leading area information representing the forefront of a storage area, and the null area information representing the forefront of the null area of the data storage area DR, and the update of the content of the same data file is performed in the area corresponding to the null area information, and also, the null area information is updated at every updating. In such a way, it is possible to improve the storing efficiency of the optical disk 1, and to simplify the processing of the storage managing information.

Description

[Detailed description of the invention] [Technical field] The present invention relates to a storage management method for optical discs.

[Prior Art] In recent years, optical disk devices that use disk-shaped optical disks as storage media have been put into practical use, and image data filing devices that handle large amounts of data,
Alternatively, it is applied to large-capacity auxiliary storage devices in electronic computer systems.

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

Furthermore, in many cases, when recording data, the surface of the recording track is destroyed, so it is not possible to update recorded data on the same recording track.

Furthermore, data is recorded/reproduced on the optical disk in sector units of a predetermined length, and data files are divided into sector units and normally stored in consecutive sectors. By recording data in units of sectors 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, we need to know the file name to identify the file, the search information necessary to search for the file, and the sector numbers (sector addresses) of the multiple sectors that store the file. ), etc., forming storage management information. Note that the information included in this storage management information is appropriately set by the operating system, file management application program, etc. in the system using the optical disk device.

By the way, as mentioned above, since optical disks cannot be rewritten, storage management information that needs to be frequently rewritten has conventionally been stored in rewritable storage devices other than optical disks, such as fixed magnetic disk devices or flexible disks. It was stored on a magnetic disk (flexible disk) device, etc.

However, if the storage management information of the optical disc is stored in a separate device in this way, the storage management of the information will be poor.
There was a problem in that it required time and effort to manage the storage management information.

[Objective] The present invention has been made to solve the disadvantages of the prior art, and provides an optical disk storage management method that can improve the storage efficiency of optical disks and simplify the processing of storage management information. is intended to provide.

[Configuration] In order to achieve this object, the present invention sets the sector length of the storage management storage area to be shorter than the sector length of the data storage area, and the storage management information includes identification information of the target data file, storage Consisting of start area information that represents the start of the area and empty area information that represents the start of the empty area in the data storage area, updates to the same data file are performed to the area corresponding to the empty area information in ``2'', and the update The above empty space information is updated from time to time.

Embodiments of the present invention will be described in detail below with reference to the accompanying drawings.

FIG. 1 shows an optical disc according to an embodiment of the present invention.

This optical disc 1 has a data area DR set on its inner circumferential side for storing cheat files, and storage management information for efficiently accessing data files stored in the data area DR on its outer circumferential side. A storage management area MR is set for storing.

A recording track formed on the optical disc 1 for recording and reproducing data is divided into sectors of a predetermined length, as shown in FIG.
Synchronization signal S for synchronizing the reading system of the playback head
S, header H for identifying the status of each sector
D and data DT of a predetermined length.

The header HD includes a recorded flag FL, which indicates that data is recorded in that sector, as shown in FIG.
G, sector type T indicating the type of sector length of the sector;
It consists of YP and sector address SA for identifying each sector.

Here, in the present invention, in order to efficiently store data files and storage management information, the data area D
The size of the data DT in the sector located in R is different from the size of the data DT in the sector located in the storage management information core.

For example, the size of data 01' in the data area DR sector is set to 2048 bytes, which is a size that can efficiently store a very large data file, and the size of data DT in the storage management area MR sector is set to 2048 bytes. , is set to a size that can efficiently store storage management information for one data file, for example, 256 bytes.

Furthermore, in order to identify sectors having different lengths, the header HD is provided with the sector type TYP, as described above.

One piece of storage management information 1) IR has a continuous length of 5ZFD of the storage management area MR, as shown in the third Effl(a).
(sector) area, and the first sector contains
As shown in the same figure (b), the length 5ZFD of this storage management information DIR is expressed in sector units, the record length LD, the file number DN set in the data file, and the file name NM set in the data file. , Registration date DA representing the date and size when the data file was registered, Start pointer SP representing the first sector of the occupied area of the data file in the data area DR, Current pointer CP representing the first sector of the empty area of the occupied area of the data file. is memorized.

Furthermore, the updated current pointer CPa is stored in other sectors of the storage management information DIR.

Here, as shown in FIG. 4(a), the data file is stored sequentially from the first sector of the area 5ZFI, with a certain area SZFL set in advance.

In addition, the changes to the Cheetah file are shown in the same figure (
As shown in b), the data is stored sequentially from the beginning of the empty area of the area 5ZFI.

Then, when a data file is newly stored, storage management information DIR is also newly created, and the area S Z F L is stored in the star 1 to pointer SI) and the pointer CP to Karen 1 stored in the first sector. Sector address of the first sector + < address, and the sector address of the first sector of the empty area when the first storage is completed is Sera 1
~ will be done.

Also, when the changes are stored, the storage management information D
In the second sector of the IR, the sector address of the first sector of the empty area when the storage of the changed contents is completed is set as a pointer CPa to the current one.

FIG. 5 shows an optical disk device according to an embodiment of the present invention.

In the figure, an interface 1 is for exchanging various data with an external device that uses this optical disk device as an auxiliary storage device.

The optical disc control unit] 2 is for controlling the recording/reproducing operation of data such as file data and storage management information, which the optical disc controller 13 performs on the optical disc 1.

The data buffer [4] temporarily stores recording data input from an external device and playback data input from the optical disc drive unit [3], and its operation is controlled by the optical disc control unit 12.

With the above configuration, when storing a data file on an optical disk, first, the external device notifies this optical disk device of the file number FN and file name NM attached to the data file, and then the data file The main body of is transferred.

The optical disk control unit 12 temporarily stores the notified file number FN and file name NM internally, and accumulates the transferred data file in the data buffer 14.

Then, the optical disk moving unit 13 seeks the first sector of the empty area of the data area DR, and then transfers the data file stored in the data buffer 14, thereby storing the data file on the optical disk 1.

When this storage process is completed, the first sector of the data file at that time and the first sector of the empty area of the area SZFL allocated to the data file at that time are set to the start pointer SP and current pointer C, respectively.
The storage management information DIR is created with the data set to P.

Further, the number of sectors of size 5ZFD is set in the record length LD of the storage management information DIR, the notified contents are set in the file number FN and file name FN, and the date of storage is set in the registration date DA.

Then, this storage management information DIR is stored in the storage management area MR.
The data is stored sequentially starting from the first sector of the empty area.

In addition, in the sectors of the data area DR and storage management area MR where data has been recorded in such storage processing,
The written flag FLG of the header HD is set to zero.

On the other hand, when the optical disc controller 12 sends the optical disc l to the optical disc agitator 13, the optical disc controller 12 controls the storage management area MR.
Then, all the storage management information DIR is read and its contents are expanded internally.

At this time, 2 sectors other than the first sector of the storage management information DIR
Written flag F after sector zero 1. , G is sesoted and valid data is stored, the J command reads the data of that sector and uses the contents of the stored current pointer CPa to set the current pointer CP (, CPa) of the sector immediately before it. ) is sequentially rewritten.

In this way, the optical disk control unit 12 always internally retains only the latest state of the empty area in the area 5ZFL of each data file.

When changing the contents of a data file already stored on the optical disk 1, the changed contents are stored starting from the sector indicated by the current pointer CP (, CPa), and the changed contents are stored in the storage area. The sector address of the next sector is stored as a new current pointer CPa in the first sector of the empty area of the storage management information DIR of the data file.

In this manner, in this embodiment, the storage management information DIR is also updated as the data file is updated.

In the embodiment described above, the first current pointer is included in the first sector of the storage management information DIR, but it can also be made independent and stored in the next sector.

[Effect] As explained above, according to the present invention, the sector length of the storage management storage area is set shorter than the sector length of the data storage area, and the storage management information includes the identification information of the target data file, the storage It consists of start area information that represents the beginning of the area and empty area information that represents the beginning of the empty area of the data storage area, and updates of the same data file are performed to the area corresponding to the above empty area information, and each time it is updated, Since the empty space information is updated, it is possible to improve the storage efficiency of the optical disc and to simplify the processing of storage management information.

[Brief explanation of the drawing]

FIG. 1 is a schematic diagram showing an optical disc according to an embodiment of the present invention, FIG. 2(a) is a schematic diagram showing an example of a sector configuration, FIG. 2(b) is a schematic diagram showing an example of a header, Figure (a) is a schematic diagram showing an example of storage management information, Figure (b) is a schematic diagram showing an example of the first sector, Figure (c) is a schematic diagram showing an example of the second and subsequent sectors. (a) is a schematic diagram illustrating the storage state of a data file, (b) is a schematic diagram illustrating the storage state of changed contents, and FIG. 5 is a block diagram showing an optical disk device according to an embodiment of the present invention. It is a diagram. ■...Optical disc, MR...Storage management area, OR/
...Data area.

Claims (1)

[Claims] In a storage management method for an optical disk in which storage management information is also stored on the optical disk, the sector length of the storage management information storage area is set shorter than the sector length of the data storage area, and the storage management information includes the identification information of the target data file, the storage It consists of start area information that represents the start of the area and empty area information that represents the start of the empty area of the data storage area, and updates of the same data file are performed to the data area that corresponds to the above empty area information, and each time it is updated. 1. A storage management method for an optical disc, comprising: additionally storing updated content of the empty space information in the storage management information.