Dynamic magnetic information storage or retrieval – Automatic control of a recorder mechanism – Controlling the head
Reexamination Certificate
2006-05-30
2006-05-30
Young, Wayne (Department: 2651)
Dynamic magnetic information storage or retrieval
Automatic control of a recorder mechanism
Controlling the head
C360S078040
Reexamination Certificate
active
07054098
ABSTRACT:
A disk drive is disclosed comprising a disk, an actuator arm, a head connected to a distal end of the actuator arm, and a voice coil motor (VCM) for rotating the actuator arm about a pivot to actuate the head over the disk, wherein the VCM rotates the actuator arm into a latched positioned when the disk drive is idle. Disk drive control circuitry unlatches the actuator arm by applying a driving current to the VCM according to an open-loop current profile. The open-loop current profile comprises an acceleration pulse having an acceleration magnitude and an acceleration interval, and a deceleration pulse having a deceleration magnitude and a deceleration interval. The deceleration magnitude is substantially smaller than the acceleration magnitude, and the deceleration interval is substantially longer than the acceleration interval, to thereby attenuate acoustic noise when unlatching the actuator arm.
REFERENCES:
patent: 4864437 (1989-09-01), Couse et al.
patent: 5568333 (1996-10-01), Bang
patent: 5600219 (1997-02-01), Gomez
patent: 5844743 (1998-12-01), Funches
patent: 6028744 (2000-02-01), Amirkiai et al.
patent: 6081112 (2000-06-01), Carobolante et al.
patent: 6097564 (2000-08-01), Hunter
patent: 6140791 (2000-10-01), Zhang
patent: 6212027 (2001-04-01), Lee et al.
patent: 6222696 (2001-04-01), Kim
patent: 6396652 (2002-05-01), Kawachi et al.
patent: 6441987 (2002-08-01), Lee
patent: 6441988 (2002-08-01), Kang et al.
patent: 6445531 (2002-09-01), Gaertner et al.
patent: 6535358 (2003-03-01), Hauert et al.
patent: 6597529 (2003-07-01), DeRosa
patent: 6624964 (2003-09-01), Pirzadeh
patent: 6791785 (2004-09-01), Messenger et al.
Nguyen David D.
Yu Jie
Olson Jason
Prejean, Esq. Jonathan E.
Sheering, Esq. Howard H.
Western Digital Technologies Inc.
Young Wayne
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