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:
Nov. 15, 2011
Filed:
Jun. 22, 2010
Hemant Melkote, San Jose, CA (US);
Donald Brunnett, Pleasanton, CA (US);
Hemant Melkote, San Jose, CA (US);
Donald Brunnett, Pleasanton, CA (US);
Western Digital Technologies, Inc., Irvine, CA (US);
Abstract
A disk drive is disclosed comprising a head actuated over a disk comprising a plurality of servo sectors defining a plurality of tracks, wherein the servo sectors are written to the disk by servoing off of spiral tracks. The head is positioned over a target track in response to the servo sectors, and coefficients of a first sinusoid are generated corresponding to the target track, wherein the first sinusoid corresponds a repeatable position error of the head relative to the target track. The coefficients of the first sinusoid comprise a coherent component due to a repeatable runout of the disk and a spiral component due to writing the servo sectors by servoing off of the spiral tracks, where the spiral component varies based on a radial location of the head. The head is servoed over the target track in response to the coefficients.