Recording and playback device and method for a disk with a plurality of zones of constant angular velocity

摘要

A data recording region of a disc is divided into a plurality of zones, the plurality of zones comprising a plurality of bands, and with a range from an innermost radius to an outermost radius being divided into four bands by four radii, with the rotational velocity of the disc at each of the bands being fixed in such a manner as to increase disc capacity. The track numbers of each zone may correspond to an integer multiple of a number of a plurality of the data units in the tracks. The number of tracks in each zone may be an integral number of times of the number of a plurality of the data units. The different zones may be used a different fixed angular velocities.