The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Dec. 06, 2011
Filed:
Jun. 23, 2010
Charles J. Calaway, Tustin, CA (US);
Ashok K. Desai, Westlake Village, CA (US);
Kenneth T. Tabacchi, Irvine, CA (US);
Charles J. Calaway, Tustin, CA (US);
Ashok K. Desai, Westlake Village, CA (US);
Kenneth T. Tabacchi, Irvine, CA (US);
Western Digital Technologies, Inc., Irvine, CA (US);
Abstract
A disk drive is disclosed comprising a disk, a head coupled to a distal end of an actuator arm, a voice coil motor (VCM) operable to rotate the actuator arm about a pivot in order to actuate the head radially over the disk, and a ramp located near an outer edge of the disk for parking the head. A first back electromotive force (BEMF) voltage of the VCM is measured, and a current is applied to the VCM for a first interval in order to move the actuator arm in a first radial direction. After the first interval, a second BEMF voltage of the VCM is measured, and whether the head is parked is detected in response to the first and second BEMF voltages.