Patent ID: 6459661
Filing Date: 2002-10-01
Classification: G11B

Abstract:
An optical disk device for conducting recording/playback of an optical disk comprising a plurality of land regions and a plurality of groove regions that are formed on a substrate, wherein said land regions alternate with said groove regions, wherein between each land region and the adjacent groove region there is defined a boundary, wherein each of said land regions and groove regions serves as a recording track that is the medium of a recording/playback information signal; and a plurality of pre-pit regions that are positioned at every other boundary, wherein each of said pre-pit regions includes address information, the optical device comprising:means for outputting, in advance, a first identifier representing whether a recording track scanned by a light beam is a land region or a groove region; a track region detection means for detecting whether said recording track scanned by the light beam is a land region or a groove region and outputting a second identifier representing a detection result; an address information extraction means for extracting address information from said recording track scanned by the light beam; and means for conducting an address calculation based on the first identifier, the second identifer, and the address information.