Optical Discs and Disc Devices

Abstract

The invention provides an optical disc and an optical disc device. The optical disc is a mixed-type optical disc having a BD layer in accordance with the BD standard and a CD layer in accordance with the CD standard. The BD layer has a management region, where information on the structure of the optical disc is recorded. The management region contains information that indicates whether there are provided information layers in accordance with the optical disc standards other than the BD standard and the CD standard.

Description

[0001] This application is a divisional application of the original patent application number 200580026036.6 (international application number: PCT / JP2005 / 015160, filing date: August 19, 2005, invention name: optical disk and optical disk device). technical field [0002] The present invention relates to an optical disc in which a plurality of information layers of different optical disc standards are multilayered into one disc, and an optical disc device for recording or reproducing information on the optical disc. Background technique [0003] In the field of information recording, research on optical discs is ongoing. Since this optical disc can be recorded / reproduced in a non-contact manner, can realize large-capacity files at low cost, and has reproduction-only, post-write, and rewritable media according to uses, it has a wide range of applications from industrial use to civilian use. application. [0004] The increase in the capacity of the above-mentioned various opt...

AI Technical Summary

Problems solved by technology

[0011] In the above-mentioned optical disc, there is the following problem, that is, when a certain information layer is being accessed, it is not clear whether there are other information layers, so when it is urgent to read or record information on other information layers, the It takes time to access the specified other information layer

[0012] And, also there is following problem in above-mentioned optical disk, promptly: because the kind of certain information layer is not recorded in other information layer, therefore when using compatible optical disk device corresponding to a plurality of optical disk standards to read and write, every time When the information layer being accessed changes, it is necessary to access the information layer to read its type, and then select the generation method of the tracking error signal corresponding to the type of information layer, and the access takes time.

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