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:
Jul. 29, 2014
Filed:
Mar. 17, 2012
Zvonimir Z. Bandic, San Jose, CA (US);
Cyril Guyot, San Jose, CA (US);
Tomohiro Harayama, Sunnyvale, CA (US);
Robert Eugeniu Mateescu, San Jose, CA (US);
Shad Henry Thorstenson, Rochester, MN (US);
Timothy Kohchih Tsai, Alviso, CA (US);
Zvonimir Z. Bandic, San Jose, CA (US);
Cyril Guyot, San Jose, CA (US);
Tomohiro Harayama, Sunnyvale, CA (US);
Robert Eugeniu Mateescu, San Jose, CA (US);
Shad Henry Thorstenson, Rochester, MN (US);
Timothy Kohchih Tsai, Alviso, CA (US);
HGST Netherlands B.V., Amsterdam, NL;
Abstract
A shingled magnetic recording hard disk drive that uses writeable cache tracks in the inter-band gaps between the annular data bands minimizes the effect of far track erasure (FTE) in the boundary regions of annular data bands caused by writing to the cache tracks. Based on the relative FTE effect for all the tracks in a range of tracks of the cache track being written, a count increment (CI) table or a cumulative count increment (CCI) table is maintained. For every writing to a cache track, a count for each track in an adjacent boundary region, or a cumulative count for each adjacent boundary region, is increased. When the count value for a track, or the cumulative count for a boundary region, reaches a predetermined threshold the data is read from that band and rewritten to the same band.