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:
Jun. 02, 2015
Filed:
Nov. 19, 2009
David Jen, San Jose, CA (US);
Indukumar Kalahasthi, San Jose, CA (US);
Kris Schouterden, San Jose, CA (US);
Douglas Zuercher, Morgan Hill, CA (US);
David Jen, San Jose, CA (US);
Indukumar Kalahasthi, San Jose, CA (US);
Kris Schouterden, San Jose, CA (US);
Douglas Zuercher, Morgan Hill, CA (US);
HGST Netherlands B.V., Amsterdam, NL;
Abstract
Approaches for adjusting the recording density of a recording medium in a circumferential direction are disclosed. A hard-disk drive includes one or more electronic components configured to divide a track, of a plurality of concentric tracks on a magnetic-recording disk, into a plurality of portions, and write data to each of the plurality of portions at a recording density that is independent of the recording density used for any of the other portions. Data may be written to a first portion of a track at a different frequency than to a second portion of the same track. The frequency at which data is written may be adjusted for different portions of the same track to allow the frequency to be reduced at certain portions shown to have relatively higher soft error rate while increasing the frequency for other portions to achieve a desired average error rate for the track.