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. 15, 2017
Filed:
Oct. 17, 2016
Applicant:
Seagate Technology Llc, Cupertino, CA (US);
Inventors:
Alfredo Sam Chu, Prior Lake, MN (US);
Wenzhong Zhu, Apple Valley, MN (US);
Siew Kin Chow, Shakopee, MN (US);
Franklin P. Martens, Bloomington, MN (US);
Assignee:
SEAGATE TECHNOLOGY LLC, Cupertino, CA (US);
Attorney:
Primary Examiner:
Int. Cl.
CPC ...
G11B 27/36 (2006.01); G11B 20/18 (2006.01); G11B 5/09 (2006.01); G11B 5/55 (2006.01); G11B 5/00 (2006.01);
U.S. Cl.
CPC ...
G11B 20/1816 (2013.01); G11B 5/09 (2013.01); G11B 5/5521 (2013.01); G11B 2005/0021 (2013.01);
Abstract
A first tone is written at a first frequency to outer tracks that surround an inner track of a magnetic recording medium. A second tone is written at a second frequency different from the first frequency to the inner track. The first and second frequencies are both lower than a frequency of an AC erase signal. A crosstrack profile of the inner track is determined based on reading amplitude of the second frequency via the read/write head.