NATHAN JOHN SANTEE
Pilots at Darrowby, San Juan Capistrano, CA
License number
California C1054875
Category
Airmen
Address
Address
21746 Darrowby, San Juan Capistrano, CA 92692
Personal information
See more information about NATHAN JOHN SANTEE at radaris.comName
Address
Phone
21791 Esmalte, Mission Viejo, CA 92692
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Disk Drive Detecting Crack In Microactuator
Disk Drive Detecting Crack In Microactuator
US Patent:
8335049, Dec 18, 2012
Filed:
Jun 7, 2010
Appl. No.:
12/794891
Inventors:
Yanning Liu - San Ramon CA, US
Chuanwen Ji - Irvine CA, US
Nathan J. Santee - Mission Viejo CA, US
Chuanwen Ji - Irvine CA, US
Nathan J. Santee - Mission Viejo CA, US
Assignee:
Western Digital Technologies, Inc. - Irvine CA
International Classification:
G11B 5/596
US Classification:
360 7805
Abstract:
A disk drive is disclosed comprising a first disk surface, a first head coupled to a distal end of an actuator arm, and a voice coil motor (VCM) and a first microactuator operable to actuate the first head over the first disk surface. A servo loop for servoing the head in response to the servo sectors is disabled, and after disabling the servo loop, the first microactuator is excited with a control signal at a test frequency in order to accentuate a crack in the first microactuator. After exciting the first microactuator, the servo loop is enabled, and after enabling the servo loop, the first microactuator is evaluated to detect the crack in the first microactuator.