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. 29, 2011
Filed:
Mar. 27, 2008
Jack M. Chue, Los Altos, CA (US);
Jack M. Chue, Los Altos, CA (US);
Western Digital Technologies, Inc., Irvine, CA (US);
Abstract
A disk drive is disclosed comprising a disk including a plurality of servo tracks defined by a plurality of servo sectors, wherein each servo sector comprises a plurality of servo bursts, and each servo burst comprises at least one of four phases. A first two of the phases are orthogonal, and a second two of the phases are orthogonal. As a head is actuated over the disk a servo sector is read to generate a read signal. The read signal is processed to demodulate the servo bursts into a position error signal (PES) representing an offset of the head from a target radial location on the disk, and the read signal is also processed to decode at least two of the phases of the servo bursts into a binary sequence.