Disk record medium, and method and apparatus for recording and r

Dynamic information storage or retrieval – Binary pulse train information signal – Binary signal gain processing

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369 58, 369 47, 369 51, 3692754, 360 51, G11B 700

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055241034

ABSTRACT:
In recording and/or reproducing data into and from a disk record medium having a record medium in which a plurality of tracks are arranged radially, the record area is divided into a plurality of zones, and a clock frequency is assigned to each zone. The data recording and/or reproducing are performed according to the clock of the frequency assigned to the respective zone. Each zone is subdivided to include a plurality of tracks, and a clock having a different frequency is assigned to each zone. Each frequency is set in such a manner that the record capacity of the track gradually becomes larger as the zone is nearer to the outer zone.

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