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:
Aug. 14, 2018
Filed:
Oct. 28, 2015
Applicant:
Seagate Technology Llc, Cupertino, CA (US);
Inventors:
Xiong Liu, Singapore, SG;
Lihong Zhang, Singapore, SG;
KianKeong Ooi, Singapore, SG;
Xiang Lu, Singapore, SG;
Assignee:
Seagate Technology LLC, Cupertino, CA (US);
Attorney:
Primary Examiner:
Int. Cl.
CPC ...
G11B 21/02 (2006.01); G11B 5/60 (2006.01); G11B 5/31 (2006.01); G11B 5/58 (2006.01);
U.S. Cl.
CPC ...
G11B 5/607 (2013.01); G11B 5/3133 (2013.01); G11B 5/582 (2013.01);
Abstract
Gain values used by a variable gain amplifier (VGA) to read servo marks of a heat-assisted recording medium are measured. Sector-specific, repeatable gain values that indicate an expected VGA gain at a desired clearance are determined based on the measured gain values. The sector-specific, repeatable gain values are used as input to a closed-loop clearance controller together with measured values of servo VGA gain while writing data to the recording medium.