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. 26, 2018
Filed:
Jan. 05, 2016
Applicant:
Western Digital Technologies, Inc., San Jose, CA (US);
Inventors:
Richard Leo Galbraith, Rochester, MN (US);
Weldon Mark Hanson, Rochester, MN (US);
Mark A. Nichols, San Jose, CA (US);
Alexander Taratorin, Palo Alto, CA (US);
Roger William Wood, Gilroy, CA (US);
Assignee:
WESTERN DIGITAL TECHNOLOGIES, INC, San Jose, CA (US);
Attorneys:
Primary Examiner:
Assistant Examiner:
Int. Cl.
CPC ...
G11B 5/596 (2006.01);
U.S. Cl.
CPC ...
G11B 5/59683 (2013.01); G11B 5/59627 (2013.01);
Abstract
A method, apparatus, and system are provided for implementing track following using signal asymmetry metrics monitored during read back in hard disk drives (HDDs). Signal asymmetry metrics monitored during read back are used together with a position error signal (PES) to correct and guide the position of a read sensor with respect to a written track in the HDD.