Hitachi, Ltd.

Sachio Kumagai

Seiji Yonezawa

Toshiaki Tsuyoshi

Wasao Takasugi

Kazuo Ichino

Masatoshi Otake

In an optical disk, one turn of a recording track is divided into a number of sectors. Each of these sectors is composed of a servo field, which is stored in advance with servo information for tracking, and a data recording area which is to be written with data. A predetermined number of these sectors are joined together to form a plurality of blocks. Each of these blocks is recorded at the data recording areas of its predetermined sectors with identification information for identifying the blocks and phase synchronization loop pull-in information for read out clocks.

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Hachioji, Japan

Sachio Kumagai