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:
Mar. 17, 2015
Filed:
Jan. 21, 2013
Western Digital Technologies, Inc., Irvine, CA (US);
Michael Chang, San Jose, CA (US);
Western Digital Technologies, Inc., Irvine, CA (US);
Abstract
A disk drive is disclosed comprising a disk comprising tracks defined by servo sectors, a head, and control circuitry comprising a servo control system operable to actuate the head over the disk in response to the servo sectors. After seeking the head to a first track, a position error signal (PES) is generated representing a difference between a target location for the head and a measured location for the head. A sinusoidal control signal is generated in response to the servo sectors, and a third point of the sinusoidal control signal is generated based on a first point and second point of the sinusoidal control signal and independent of the PES, wherein the first, second and third points correspond to respective servo sectors. A feed-forward compensation value is generated based on the third point of the sinusoidal control signal using a feed-forward compensator.