Compensation for repeatable run-out error

Details Compensation for repeatable run-out error Compensation for repeatable run-out error

1998-06-29

2000-05-30

Burgess, Glenton B.

Dynamic magnetic information storage or retrieval

Automatic control of a recorder mechanism

Controlling the head

G11B 5596

Patent

active

060697644

ABSTRACT:
A method and apparatus for compensating for repeatable run-out errors in a disc drive is disclosed. The compensation is created by determining transfer function values for a servo loop in the drive as well as a sequence of repeatable run-out values for a portion of a disc. The repeatable run-out values are divided by respective transfer function values to produce compensation values that are inverse transformed to produce time-domain compensation values. These time-domain compensation values are injected into the servo loop to compensate for repeatable run-out errors.

REFERENCES:
patent: 5444583 (1995-08-01), Ehrlich et al.
patent: 5535072 (1996-07-01), Witt et al.
patent: 5539714 (1996-07-01), Andrews, Jr. et al.
patent: 5550685 (1996-08-01), Drouin
patent: 5608586 (1997-03-01), Sri-Jayantha et al.

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