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:
Mar. 04, 2014
Filed:
Dec. 12, 2011
Jonathan Darrel Coker, Rochester, MN (US);
Martin Aureliano Hassner, Mountain View, CA (US);
Kirk Hwang, Palo Alto, CA (US);
Bruce Alexander Wilson, San Jose, CA (US);
Roger William Wood, Gilroy, CA (US);
Jonathan Darrel Coker, Rochester, MN (US);
Martin Aureliano Hassner, Mountain View, CA (US);
Kirk Hwang, Palo Alto, CA (US);
Bruce Alexander Wilson, San Jose, CA (US);
Roger William Wood, Gilroy, CA (US);
HGST Netherlands B.V., Amsterdam, NE;
Abstract
A 'write-squeeze-verify' method is used for verification of the data that has been written in the annular bands of a shingled magnetic recording disk drive. The writing of data along a track overwrites a portion of the previously written track and thus 'squeezes' the data of the previously written track to thereby form a “shingled data track” (SDT). The data in each SDT is read back and verified by an error correction check using error correction bits associated with the data written in the SDT, or by comparing the readback data with the data stored in memory. If the data read back is not verified, a write error counter is incremented and a write error frequency is calculated. One or more attempts to write the data can be performed. If the data in the SDT cannot be verified after the attempted rewrite(s), then a “re-try fail” is reported.