Reduced seek acoustic noise direct access storage device

Details Reduced seek acoustic noise direct access storage device Reduced seek acoustic noise direct access storage device

1995-05-31

1999-05-04

Psitos, Aristotelis M.

Dynamic magnetic information storage or retrieval

Automatic control of a recorder mechanism

Controlling the head

360 7804, G11B 555

Patent

active

059010096

ABSTRACT:
A disk drive with reduced seek acoustic noise and a method for implementation, without any additional hardware or mechanical modifications to the actuator includes a filter such that servo-loop stability is unaffected. The filter is inserted outside the existing servo loop to reshape the existing velocity profile in real time and to facilitate the suppression of forcing components that produce seek acoustics. A weighting factor may be used to provide a weighted average of the filtered and unfiltered velocity reference signal to the servo loop so that at the end of a track seek operation, the unfiltered reference signal is applied to the velocity servo, and there is almost no change in settle-out performance when the target track is reached. It is not necessary to store large volumes of velocity profile data to deal with different seek lengths.

REFERENCES:
patent: 4677507 (1987-06-01), Elliott
patent: 5257251 (1993-10-01), Chow et al.
patent: 5309299 (1994-05-01), Crossland et al.
patent: 5392174 (1995-02-01), Suzuki
patent: 5465034 (1995-11-01), Andrews, Jr. et al.

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