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. 30, 2010
Filed:
Dec. 11, 2008
Applicant:
Mark R. Mccornack, Los Gatos, CA (US);
Inventor:
Mark R. McCornack, Los Gatos, CA (US);
Assignee:
Western Digital Technologies, Inc., Lake Forest, CA (US);
Attorney:
Primary Examiner:
Int. Cl.
CPC ...
G11B 27/036 (2006.01); G11B 21/02 (2006.01); G11B 5/09 (2006.01);
U.S. Cl.
CPC ...
Abstract
A method of writing servo data onto a disk is disclosed. A spindle motor spins the disk, and a back electromotive force (BEMF) signal is measured from the spindle motor. A repeatable phase error (RPE) is extracted from the BEMF signal to generate an adjusted BEMF signal. A servo write clock is synchronized in response to the adjusted BEMF signal, and the servo data is written to the disk using the servo write clock. In one embodiment, the servo data comprises spiral seed patterns that are processed to write concentric servo sectors to the disk.