| 摘要 |
In the recordable type multilayer optical disk, locations of an information recording unit region and of ID or address data of adjacent plural tracks on a recording medium are configured so as to be shifted in the circumferential direction by 5 mum or more. Since an effect from a layer that is not selected can be remarkably reduced, multilayer recording/reproducing can be realized. Moreover, ID or address data do not center at the same position in reference to the circumferential direction, the effect of distortion that is generated on the disk substrate and the recording layer at the time of optical disk formation or multiple overwriting can be minimized, and design and fabrication tolerances of the optical disk are extended, and, as a result, the media can be provided with a low cost.
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