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:
Sep. 17, 2013
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 (SMR) hard disk drive (HDD) essentially eliminates the effect of far track erasure (FTE) in the boundary regions of annular data bands caused by writing in the boundary regions of adjacent annular data bands. The extent of the FTE effect is determined for each track within a range of tracks of the track being written. Based on the relative FTE effect for all the tracks in the range, a count increment (CI) table or a cumulative count increment (CCI) table is maintained for all the tracks in the range. For every writing to a track in a boundary region, a count for each track in an adjacent boundary region, or a cumulative count for the adjacent boundary region, is increased. When the count reaches a predetermined threshold the data is read from that band and rewritten to the same band.