Magnetic disk which reduces deterioration in regenerated signals

Details Magnetic disk which reduces deterioration in regenerated signals Magnetic disk which reduces deterioration in regenerated signals

1995-08-15

1998-06-30

Levy, Stuart S.

Dynamic magnetic information storage or retrieval

Record medium

Disk

369 14, 3692751, G11B 5596

Patent

active

057743134

ABSTRACT:
A magnetic disk has optical servo grooves formed at specified intervals along data tracks so that variations in reflected light of light applied to the grooves are detected so as to allow a magnetic head to perform tracking servo. A level difference between a regenerative signal and a fundamental wave of modulation noise during reads of data recorded on the data tracks (4A, 4B) is set to 28 dB or more. Thus, comb-shaped modulation in a regenerative signal due to optical servo grooves is reduced so that output drop of the regenerative signal is suppressed and deterioration of window margin and the like is lessened.

REFERENCES:
patent: 4123788 (1978-10-01), Kruger
patent: 4935835 (1990-06-01), Godwin et al.
patent: 4961123 (1990-10-01), Williams et al.
patent: 5067039 (1991-11-01), Godwin et al.
patent: 5430594 (1995-07-01), Umebayashi et al.

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