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:
Jan. 10, 2012
Filed:
Feb. 11, 2010
Baoliang Zhang, Foothill Ranch, CA (US);
Teik EE Yeo, Trabuco Canyon, CA (US);
Johanes S. MA, Lake Forest, CA (US);
Baoliang Zhang, Foothill Ranch, CA (US);
Teik Ee Yeo, Trabuco Canyon, CA (US);
Johanes S. Ma, Lake Forest, CA (US);
Western Digital Technologies, Inc., Irvine, CA (US);
Abstract
A disk drive is disclosed comprising a disk, a head for writing data to the disk, and control circuitry coupled to the head. The control circuitry is operable to write data to the plurality of data tracks, read a first data area of a first data track to generate a first read back signal, determine a first quality metric and a channel flag in response to the first read back signal, determine that the first quality metric exceeds a first threshold, apply additional stress to the first data area, reread the first data area to generate a second read back signal, determine a second quality metric in response to the second read back signal, and determine whether the second quality metric exceeds a second threshold.