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:
Feb. 28, 2006
Filed:
Aug. 16, 2004
Estimating a writer/reader gap in a disk drive by measuring write/read times relative to a sync mark
William A. Sargenti, Jr., Corona, CA (US);
Khoa Xuan Bui, San Jose, CA (US);
Teik E E Yeo, Trabuco Canyon, CA (US);
Alvin W. Tan, Lake Forest, CA (US);
William A. Sargenti, Jr., Corona, CA (US);
Khoa Xuan Bui, San Jose, CA (US);
Teik E E Yeo, Trabuco Canyon, CA (US);
Alvin W. Tan, Lake Forest, CA (US);
Western Digital Technologies, Inc., Lake Forest, CA (US);
Abstract
A method of estimating a writer/reader gap in a disk drive is disclosed. During a first revolution of the disk, a clock is synchronized to a first preamble and used to measure a write delay to write a second sync mark to the disk relative to a first sync mark. During a second revolution of the disk, the clock is again synchronized to the first preamble and used to measure a read delay required to detect the second sync mark relative to the first sync mark. The writer/reader gap is then estimated in response to the measured write delay and the measured read delay, for example, by computing a difference between the measured write delay and the measured read delay.