Optical disk having a large storage capacity

Details Optical disk having a large storage capacity Optical disk having a large storage capacity

1997-05-23

1998-11-24

Dinh, Tan

Dynamic information storage or retrieval

Storage medium structure

Optical track structure

3692754, G11B 724

Patent

active

058417575

ABSTRACT:
A magneto-optical disk has a recording film on a substrate for defining a data area. The data area is divided into a plurality of zones in the radial direction, and each zone has a plurality of physical tracks divided into a plurality of sectors along the tracks. Number of sectors per physical track in each zone is increased as viewed toward the outer edge of the disk one by one. The shortest mark length in specified zones in the vicinity of the inner and outer edges of the disk is longer than that in other zones to thereby improve reliability in recording/reproducing characteristics in the specified zones, which have otherwise degraded recording/reproducing characteristics due to inferior physical characteristics of the recording film.

REFERENCES:
patent: 5418773 (1995-05-01), Bakx et al.
patent: 5592452 (1997-01-01), Yoshimoto et al.
patent: 5684774 (1997-11-01), Yamamuro
patent: 5717683 (1998-02-01), Yoshimoto et al.

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