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:
Dec. 14, 2010
Filed:
Jan. 29, 2008
Jiangang Liang, Sunnyvale, CA (US);
Charles A. Park, Aromas, CA (US);
Yilin Cai, Fremont, CA (US);
Siri S. Weerasooriya, Campbell, CA (US);
Jiangang Liang, Sunnyvale, CA (US);
Charles A. Park, Aromas, CA (US);
Yilin Cai, Fremont, CA (US);
Siri S. Weerasooriya, Campbell, CA (US);
Western Digital Technologies, Inc., Lake Forest, CA (US);
Abstract
A disk drive that approximates spiral slope in spiral patterns is disclosed. The disk drive includes a disk having at least one spiral pattern that extends radially across the disk, a head to read a portion of the at least one spiral pattern, and a processor to approximate a spiral slope of the portion of the at least one spiral pattern. The processor approximates the spiral slope of the portion of the at least one spiral pattern by implementing operations including: reading amplitude values for the portion of the at least one spiral pattern; determining an amplitude value distribution based on the amplitude values; determining a curve-fitted function for the amplitude value distribution; and determining an approximate spiral slope based on the curve-fitted function.