Patent ID: 7102986

Claim:
An optical disk comprising: at least a rewritable region and a read-only data region, wherein the rewritable region includes a plurality of groove tracks and a plurality of land tracks, the read-only data region includes a plurality of groove tracks and a plurality of land tracks, read-only data comprising control data are written as concavo-convex pits to the groove tracks and/or the land tracks in the read-only data region, and the width of each groove in the read-only data region is smaller than that of each groove in the rewritable region, wherein the read-only data written as the concavo-convex pits formed in the groove tracks have contents different from the read-only data written as the concavo-convex pits formed in the land tracks, the read-only data written as the concavo-convex pits formed in the groove tracks are data related to the groove tracks in the rewritable region, and the read-only data written as the concavo-convex pits formed in the land tracks in the read-only data region are data related to the land tracks in the rewritable region.