Rapid off track detection using in-drive microactuator

Details Rapid off track detection using in-drive microactuator Rapid off track detection using in-drive microactuator

2006-01-31

2009-10-13

Feild, Joseph H (Department: 2627)

Dynamic magnetic information storage or retrieval

Automatic control of a recorder mechanism

Controlling the head

C360S031000

Reexamination Certificate

active

07602577

ABSTRACT:
A microactuator incorporated within an actuator assembly of a disk drive is used as a detection element for rapid off track events that may occur. Preferably, the microactuator employs one or more piezoelectric elements used for purposes of secondary actuation. Uncontrolled movement of the actuator across the disk results in the piezoelectric elements generating a voltage spike or signal that is analyzed to determine whether a rapid off track event has occurred. Rapid off track events are distinguished from other possible events, such as shock events. If a rapid off track event is detected, then remedial actions are taken to restore data integrity, to include executing restore commands such as rewriting selected data tracks. Dedicated piezoelectric elements may also be provided for detecting rapid off track events wherein these elements are not incorporated in the servo loop that controls positioning of the actuator.

REFERENCES:
patent: 6538839 (2003-03-01), Ryan
patent: 6600619 (2003-07-01), Morris et al.
patent: 6600622 (2003-07-01), Smith
patent: 6781780 (2004-08-01), Codilian
patent: 6882489 (2005-04-01), Brunnett et al.
patent: 7253987 (2007-08-01), Shim et al.

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