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:
Aug. 18, 2009
Filed:
Oct. 26, 2007
Teddy T. C. Chen, Huntington Beach, CA (US);
Eugene Chun-tsing Wu, Irvine, CA (US);
John Yin Kwong LI, Laguna Niguel, CA (US);
Jie Yu, Irvine, CA (US);
Jonathan V. Nguyen, Laguna Niguel, CA (US);
Tuong M. VU, Lake Forest, CA (US);
Guoxiao Guo, Foothill Ranch, CA (US);
Teddy T. C. Chen, Huntington Beach, CA (US);
Eugene Chun-Tsing Wu, Irvine, CA (US);
John Yin Kwong Li, Laguna Niguel, CA (US);
Jie Yu, Irvine, CA (US);
Jonathan V. Nguyen, Laguna Niguel, CA (US);
Tuong M. Vu, Lake Forest, CA (US);
Guoxiao Guo, Foothill Ranch, CA (US);
Western Digital Technologies, Inc., Lake Forest, CA (US);
Abstract
A disk drive is disclosed comprising a plurality of servo sectors that define a plurality of tracks, and a head comprising a read element radially offset from a write element. The read element is positioned over a first track, and the first track is read to generate first read wedge repeatable runout (WRRO) values. A first seek operation of the head positions the read element over a second track, and the second track is read to generate first write WRRO values. The first write WRRO values are used to write the first read WRRO values to the first track. A second seek operation of the head positions the read element over a third track, and the third track is read to generate second write WRRO values. The second write WRRO values are used to write the first write WRRO values to the second track.