JPH02115955A - System for managing control file of optical disk - Google Patents

Abstract

PURPOSE:To effectively use the file area of the control file of an optical disk by providing a deletion record registration means and a deletion record output means, and reusing a deleted index record as an index record for the registration of new image data. CONSTITUTION:When image data is deleted, the index record can be made into a deletion record by setting a deletion flag on the index record of the control file 6 by a deletion flag setting means 1. The deleted index record is connected to a deletion record chain by a deletion record registration means 2. When the image data is registered, one deletion record is taken out by the deletion record output means 3 in the case of using the index record up to the one at the final position in the control file 6. The deletion record is made into an effective record by deleting the deletion flag of the deletion record by a deletion flag deleting means 4, and the index information of the image data desired to register is registered.

Description

[Detailed Description of the Invention] (Field of Industrial Application) The present invention relates to a control file management method for optical discs.
In particular, the present invention relates to an optical disk control file management method in an optical disk search system that writes image data to an optical disk device and creates an index section of the written image data in a control file on a magnetic disk device.

(Prior art) Conventionally, in this type of optical disk control file management method,
When deleting image data registered on the optical disk device, a deletion flag is set in the index record of the image data to be deleted in the control file on the magnetic disk device, and the index record is made into a deletion record. However, this deleted record cannot be reused as an index record for registering new image data.

(Problem to be Solved by the Invention) In the conventional optical disk control file management method described above, when the index record of the control file on the magnetic disk device is deleted, the index record for registering new image data is deleted. Because the index record at the last position in the control file is used up, no more image data can be registered, and the control file must be reorganized in order to reuse deleted records. There is a drawback.

(Means for Solving the Problems) An optical disk control file management method according to the present invention is an optical disk control file management method that creates an index section of image data written in an optical disk device in a control file on a magnetic disk device. Deletion flag setting means for converting the index record into a deletion record by setting a deletion flag in an index record of a control file pointing to image data to be deleted; and deletion of the deleted index record in the index record. Deletion record registration means that connects to the deletion record chain using a chain field; Deletion flag deletion means that deletes the deletion flag of the retrieved deletion record to make it a valid record; and the index that has been made a valid record. and index information writing means for registering index information of image data to be registered in a record.

(Example) Next, the present invention will be explained with reference to the drawings.

FIG. 1(A) and FIG. 1 CB) are functional block diagrams showing one embodiment of the present invention, including a deletion flag determining means 1, a deletion record registration means 2, a deletion record acquisition means 3, and a deletion flag erasing means 4. , index information document sender's 5 steps.

FIG. 2 shows the relationship between the control file 6 on the magnetic disk device and the image data file 7 on the optical disk device.
The index record on the control file 6 and the image data on the image data file 7 have a 1:1 relationship.0 For example, index record a has index information for image data a written therein.

FIG. 3 shows an example of the record (index record) format of the control file 6. The storage position of the image data on the optical disk device is registered in the index record.

For example, when reading image data registered on an optical disk device, first read the index record on the control file 6, find out the storage location (address) of the image data on the index record on the optical disk device,
The optical disk device is accessed using that address.

Furthermore, index records with deletion flags set are skipped as deletion records when reading the control file 6.

Figure 1 (A) shows the process for deleting index records.
).

When deleting image data, the deletion flag setting means 1 sets a deletion flag in the index record of the control file 6 pointing to the image data, thereby converting the index record into a deletion record. By converting the index record into a deleted record, the image data becomes unreadable, and as a result, it is deleted. The deleted index record is connected to the deleted record chain by the deleted record registration means 2. The deletion chain field in the index record is heavily used to connect to the deletion record chain.

It was then recorded as a deleted record. Processing when reusing index records will be explained with reference to FIG. 1(B).

When registering image data, if the index record at the last position of the control file 6 has already been used, the deleted record extracting means 3 counts out one deleted record from the deleted record chain.

The deletion flag of the retrieved deletion record is deleted by a deletion flag deletion means 4 to make it a valid record.

The index of the image data that is about to be registered in the index record made into a valid record by the index information writing means 5 +7! Register information.

(Effects of the Invention) As explained above, the present invention provides a deleted record registration means and a deleted record retrieval means, and reuses deleted index records as index records for registering new image data. This has the effect of effectively using the file area of the control file of the optical disk.

[Brief explanation of the drawing]

Figures 1 (A) and (B) are diagrams showing an embodiment of the optical disk control file management method according to the present invention, and Figure 2 shows the relationship between the control file on the magnetic disk device and the image data file on the optical disk device. FIG. 3 is a diagram showing an example of the record (index record) format of the control file. DESCRIPTION OF SYMBOLS 1... Deletion flag setting means, 2... Deletion record registration means, 3... Deletion record retrieval means, 4... Deletion flag erasing means, 5... Index information writing means, 6...
Control file, 7... Image data file.

Claims (1)

[Claims] In an optical disk control file management method that creates an index section of image data written to an optical disk device in a control file on a magnetic disk device, a deletion flag is set in the index record of the control file that points to the image data to be deleted. a deletion flag setting means for converting the index record into a deletion record by doing so; a deletion record registration means for connecting the deleted index record to a deletion record chain using a deletion chain field in the index record; and an index information writing means for registering index information of image data to be registered in the index record that has been made a valid record. A control file management method for optical discs, which is characterized by: