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. 02, 2019
Filed:
Jul. 02, 2018
Applicant:
Seagate Technology Llc, Cupertino, CA (US);
Inventors:
Drew Michael Mader, Bloomington, MN (US);
Ian James Gilbert, Chanhassen, MN (US);
Walter R. Eppler, Cranberry Township, PA (US);
Tim Rausch, Farmington, MN (US);
Assignee:
Seagate Technology LLC, Cupertino, CA (US);
Attorney:
Primary Examiner:
Int. Cl.
CPC ...
G11B 11/00 (2006.01); G11B 5/09 (2006.01); G11B 5/00 (2006.01); G11B 5/60 (2006.01); G11B 7/1263 (2012.01); G11B 7/1267 (2012.01); G11B 7/126 (2012.01);
U.S. Cl.
CPC ...
G11B 5/09 (2013.01); G11B 5/6088 (2013.01); G11B 7/126 (2013.01); G11B 7/1263 (2013.01); G11B 7/1267 (2013.01); G11B 2005/0021 (2013.01);
Abstract
Pseudorandom bit sequences are recorded to a heat-assisted recording medium at a laser power that is stepped while recording the pseudorandom bit sequences. The pseudorandom bit sequences are read from the heat-assisted recording medium to determine timing differences between bits written before and after the laser power is stepped. A thermal gradient of bits written to the heat-assisted recording medium is determined based on the timing differences.