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:
Sep. 27, 2011
Filed:
Aug. 24, 2009
Pantas Sutardja, Los Gatos, CA (US);
Sukpaket Katchmart, Campbell, CA (US);
Henri Sutioso, Saratoga, CA (US);
David Liaw, Newark, CA (US);
Pantas Sutardja, Los Gatos, CA (US);
Sukpaket Katchmart, Campbell, CA (US);
Henri Sutioso, Saratoga, CA (US);
David Liaw, Newark, CA (US);
Marvell International Ltd., Hamilton, BM;
Abstract
A hard disk controller (HDC) of a hard disk drive (HDD) includes a read module, a clock generator module, and a write module. The read module reads servo spirals from a magnetic medium of the HDD via a read head of the HDD and generates read signals. The clock generator module generates a spiral clock having a first frequency based on the read signals and generates based on the spiral clock R write clocks having R frequencies, respectively, that are different than the first frequency, where R is an integer greater than 1. The write module writes via a write head of the HDD a first servo wedge on a first one of R zones of the magnetic medium using a first one of the R write clocks and a second servo wedge on a second one of the R zones using a second one of the R write clocks.