Patent ID: 6980490

Claim:
An optical disk, comprising: a first dielectric layer, a magnetic layer, and a second dielectric layer on a disk-shaped substrate in which pits and grooves have been embossed; wherein a data region used for recording/reproducing data comprises a plurality of tracks from an innermost track to an outermost track, each of the tracks comprising a plurality of segments, and each of the segments comprising a pit region and a groove region; wherein the pit regions have at least a pair of sample servo wobble pits and an address pit for the track address, and tracks provided in the data region for recording/reproducing data are made of grooves; wherein tracks are magnetically separated from one another by scanning a focused light beam over lands between tracks at a predetermined power and annealing to lower the magnetic anisotropy of the magnetic layer; and wherein the optical disk comprises a power testing region comprising one or more tracks for finding the predetermined annealing power at the location of at least one of the group consisting of a specific region within the data region, a region more to the inner side than the innermost track of the data region, and a region more to the outer side than the outermost track of the data region.