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:
Mar. 28, 2017
Filed:
Sep. 03, 2013
Applicant:
Seagate Technology Llc, Cupertino, CA (US);
Inventors:
Xuan Zheng, Savage, MN (US);
Timothy William Stoebe, Minnetonka, MN (US);
Assignee:
SEAGATE TECHNOLOGY LLC, Cupertino, CA (US);
Attorney:
Primary Examiner:
Int. Cl.
CPC ...
G11B 27/36 (2006.01); G11B 5/60 (2006.01); B41J 2/355 (2006.01);
U.S. Cl.
CPC ...
G11B 27/36 (2013.01); B41J 2/355 (2013.01); G11B 5/607 (2013.01); G11B 5/6076 (2013.01);
Abstract
A data storage system includes a recording head and a compensating resistor. The recording head has a heating element. The compensating resistor is in electrical series with the heating element and is external to the recording head. A method includes applying an alternating current at a first angular frequency to a recording head. A voltage drop across the recording head heating element is measured. A component of the voltage drop is extracted. The component has a frequency that is three times the frequency of the first angular frequency.