JPS61255535A - Optical disk medium - Google Patents

Abstract

PURPOSE:To avert the access to a defective region and to increase a processing speed by writing track aligning information onto a medium and writing preliminarily the track alignable information in a recording area into the specific region on the medium. CONSTITUTION:The tracks and sectors are constituted on the optical disk medium. The start track number and end track number of three track alignable regions 2, 8, 10 are written into the track alignable track label (ATL1) region 4. The number of spare tracks, the number of the alignable tracks, etc. are preliminarily written into the region 4. The sector constitution of the ATL1 region is as shown in the figure. The track alignable tracks on the disk medium are preliminarily checked and the start track number and end track number of the track alignable region are written into 17-22 of the ATL1. The access to the defective region is averted by reading the track label and knowing the track alignable region, by which the processing speed is improved and the efficient use of the medium is made possible.

Description

DETAILED DESCRIPTION OF THE INVENTION Field of the Invention The present invention relates to an optical disc medium for recording and reproducing digital data.

BACKGROUND OF THE INVENTION Conventionally, optical disk devices using optical disk media for recording and reproducing digital data have controlled track positioning by reading specific data previously recorded on the medium.

Problems to be Solved by the Invention However, in the conventional optical disk medium described above, track positioning is controlled by reading specific data recorded in advance on the medium. 2 If the medium is narrow and there is a defect, etc., it becomes impossible to read specific data on the medium, and as a result, it becomes impossible to position the track and the medium becomes unusable. There is a drawback.

The present invention has been made in view of the above-mentioned conventional circumstances.
Accordingly, an object of the present invention is to provide a novel optical disc medium that makes it possible to eliminate the above-mentioned drawbacks inherent in the conventional technology.

Means for Solving the Problems In order to achieve the above object, the optical disk medium according to the present invention is a medium for recording digital data, in which information of an area on the medium where track positioning is possible is recorded in advance in a specific area on the medium. DESCRIPTION OF THE PREFERRED EMBODIMENTS Next, a preferred embodiment of the present invention will be described in detail with reference to the drawings.

FIG. 1 shows a logical structure on an embodiment of a disk medium according to the present invention. This optical disc medium is composed of tracks and sectors.

The disk medium according to the present invention has a track positionable area (1) provided at one location on the medium.
t sr and track positionable area (i) lo
, Alternate Sector 3, Trunk Locator Label (ATL t ) u, Initial Program Load (IP
L) Area! and its replacement sector 6, the primary volume label (primary VOL/) area, and the spare track area l/ reserved to allocate a replacement sector when a bad sector occurs.
and a secondary volume label (secondary VOL/) area/co.

With this logical structure, there are three trunk positionable areas, f
fP and 10 start track number and end track number as track positionable track labels (ATL/
) It is written in Territory-tei. The number of spare tracks, the number of positionable tracks, etc. are written in this track positionable track label (ATL/) area. Track Positionable Track Label (ATI, /
) The sector configuration of the area reference is shown in Figure 2.

The /3 from the label indicates that this sector is a track-locatable track label (ATL/), the number of spare tracks /41 indicates the number of spare tracks on the volume of the media, and /j indicates the number of spare tracks on the volume of the media. This is a spare byte, and the number of track positionable areas 16 indicates the number of positionable areas consisting of consecutive track positionable tracks on the volume. Track positionable area (first track number l, track positionable area (1)
End track number of λ/E, start track number of track positionable area (1)/? ,) Rack positionable area (1) end track number of g, 26. Track positionable area (seal) Start track number of IO /,
2 and the end track number - of the track positionable area (m) to. This is a spare area for writing the start and end track numbers when the number of track positionable areas increases.

The track positionable tracks on the disk medium are checked in advance, and the start track number and end track number of the track positionable area are written in the positionable track label (ATL/).

Effects of the Invention By having the configuration as described above, the present invention enables track positioning of tracks 2 and 2 that are written in advance.
By reading the bell and knowing the area in which the track can be positioned, access to defective areas can be avoided, processing speed can be improved, and the medium can be used more efficiently.

[Brief explanation of the drawing]

FIG. 1 is a diagram showing a logical structure on an optical disk medium according to an embodiment of the present invention, and FIG. 1 is a diagram showing an example of a sector configuration of a track positionable track label (ATL/) in the logical structure. .

Claims (1)

[Claims] In optical disc media for recording digital data,
An optical disc medium characterized in that track positioning information is written on the medium in advance, and information on an area in a recording area where track positioning is possible is previously written in a specific area on the medium.