JPH0443333B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to an optical disc medium that can be distinguished from other optical disc media.

〔overview〕

The present invention provides an optical disk medium in which information that can be distinguished from other optical disk media is written in any track or sector of the optical disk medium during the manufacturing process, so that a desired optical disk can be easily created by simply reading this information. This allows you to select the medium.

[Conventional technology]

Conventionally, optical disk media used in optical disk devices do not have numbers written on them to distinguish them from other optical disk media as they are manufactured. This is because conventional optical disk devices were replaceable one by one, so it was only necessary to know the state of information inside the optical disk medium, and there was no need to distinguish it from other media.

However, with the increasing capacity of information recording systems becoming necessary, optical disk devices can also store multiple optical disk media and automatically retrieve and access the required optical disk media from the storage location. Such devices have come into use. In this case, it is necessary to distinguish the required optical disk medium from other optical disk media. As a method for making this distinction, there is a method of detecting the storage location and selecting a desired optical disk medium, but with this method, it is not possible to easily exchange or change the optical disk medium. Therefore, in the conventional technology, when a new optical disk medium is first accessed, a special number is written on the optical disk medium to distinguish it from other optical disk media, and thereafter this number is used to distinguish it from other optical disk media. The number was read to determine whether it was the desired optical disk medium.

[Problem that the invention seeks to solve]

However, in such a conventional system, if an error occurs when writing the first number on a non-rewritable optical disk medium, the optical disk medium becomes unusable.

Furthermore, optical disk media are more susceptible to media defects than magnetic disk media, and are therefore more likely to cause write errors. Therefore, if a number writing error occurs, there is a problem that some media may become unusable even if they are unused.

The present invention solves these conventional problems and aims to provide an optical disc medium with improved numbering that can be distinguished from other optical disc media.

[Means for solving problems]

The present invention is characterized by a structure in which information that can be distinguished from other optical disk media is written in any track or sector of this optical disk medium during the manufacturing process.

The information that can be distinguished from other optical disc media is preferably the serial number of the optical disc medium.

[Effect]

The present invention provides an optical disc device that accommodates a plurality of optical disc media by writing different information (for example, a serial number) on any track or sector of an optical disc medium during the manufacturing process. A desired optical disc medium can be easily selected just by reading out the information.

〔Example〕

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

A first example will be described. The figure is a schematic diagram of an optical disk medium used in this example. Since this optical disk medium cannot be rewritten, there are inspection tracks 2 and 3 on the outside and inside of the track 1 used for inspection. Normally, this part is used to inspect optical disk media and only those with no abnormalities are shipped. In this inspection step, for example, a serial number is written on the innermost track 4 of the used track 1, and those with the correct number written are shipped as non-defective products. Thereby, by reading the number written on the innermost track 4, it is possible to always distinguish between optical disk media.

Next, a second embodiment will be described. Normally, optical disc media are produced by creating a master and using it as a mold by placing or the like. At this time, indexes such as grooves and track numbers are also created as irregularities on the master and are copied onto the optical disk medium. Therefore, when manufacturing a master, a serial number is also formed on an arbitrary track, in this example, the innermost track 4, and by manufacturing an optical disc medium, an optical disc medium with a serial number is created.

In this case, multiple optical disc media with the same number are created, but the optical disc media device used for playback cannot accommodate more than two optical disc media manufactured in this way at the same time, causing a problem. There isn't.

By using the optical disk medium manufactured as described above, when accessing the optical disk medium in an optical disk device that accommodates multiple disks,
There is no need to write an identification number.

〔Effect of the invention〕

As explained above, the present invention allows a desired optical disk medium to be reliably distinguished from other optical disk media by assigning a number to the optical disk medium during the manufacturing process to distinguish it from others. This has the effect of making it easier to change the storage position or replace the item.

[Brief explanation of drawings]

The figure is a schematic diagram of an optical disk medium according to an embodiment of the present invention. 1...Track used, 2...Inner inspection track, 3...Outer inspection track, 4...Innermost track, 5...Index.

Claims (1)

Claims: 1. An optical disk medium characterized by having a structure in which information distinguishable from other optical disk media is written in any track or sector of the optical disk medium during the manufacturing process. 2. The optical disc medium according to claim 1, wherein the information that can be distinguished from other optical disc media is the serial number of the optical disc medium.