Importance

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Abstract

An apparatus for recording data on an M-CAV-formatted optical disk. The disk has a plurality of substantially concentric tracks grouped into a plurality of zones arranged in a radial direction of the disk. Each of the zones is divided into the same number of sectors, each used as a unit area, and has a different assigned frequency at which to read read data from the sectors. Header information is recorded in the start region of each sector and identifies the sector. Provided next to the start region is a data field in which data is to be recorded. The apparatus is designed to record data in the data field by using a master clock signal having a specific frequency assigned to the zone including that data field. The apparatus has a master clock setting circuit for setting the frequency assigned to any zone to which the zone will be switched from the zone in which data is being recorded. When the zone is switched to that zone, the gain of the master clock setting circuit is increased temporarily, thereby switching the frequency of the master clock signal within a short time.

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First Claim