Eccentricity detection and compensation of a disk by a preformat

Details Eccentricity detection and compensation of a disk by a preformat Eccentricity detection and compensation of a disk by a preformat

1992-05-28

1994-03-22

Dzierzynski, Paul M.

Dynamic information storage or retrieval

Storage medium structure

Optical track structure

369 4432, 369 4426, 3692753, 360 7704, G11B 7007

Patent

active

052971317

ABSTRACT:
An area for recording a preformated encoding pattern is provided on a rewritable disk in order to obtain information of an eccentricity produced when the disk is chucked. The information of the eccentricity produced at the time of disk chucking is detected, while the disk is being driven, from a reference pulse obtained by reproduction of the encoding pattern and, on the basis of the eccentricity information, the frequency of the clock for writing data or reading data is modulated according to eccentric positions.

REFERENCES:
patent: 4685096 (1987-08-01), Romeas
patent: 4754339 (1988-06-01), Nagai et al.
patent: 4955008 (1990-09-01), Collomey et al.
patent: 5042021 (1991-08-01), Nagano et al.
patent: 5121374 (1992-06-01), Barton et al.
patent: 5140575 (1992-08-01), Fushiki

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