Optical disk and optical disk drive device

摘要

In an optical disk having information recording tracks in the form of land and groove tracks, the disk is divided into a plurality of annular zones, each revolution of the information recording track belongs to one of the zones, and each revolution of the information recording track is divided into a plurality of sectors. A header portion is provided at the head of each sector and includes multiple recognition patterns which are each formed of a sequence of pits. A recognition pattern has a pattern which is not used as a pattern for data or addresses in the information recording part. The disk may be of a land/groove single-spiral configuration. The header portion for each sector may have a plurality of sub-headers, including an address of the sector, and first and second recognition patterns. The address of the sector and the first recognition pattern may be shifted in one radial direction by half a track pitch and the second recognition pattern shifted in the other radial direction by half a track pitch.