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:
Apr. 11, 2023
Filed:
Dec. 29, 2021
Applicant:
Seagate Technology Llc, Fremont, CA (US);
Inventors:
Thomas Young Chang, Menlo Park, CA (US);
Philip L. Steiner, Los Altos, CA (US);
Zengyuan Liu, Eden Prairie, MN (US);
Assignee:
SEAGATE TECHNOLOGY LLC, Fremont, CA (US);
Attorney:
Primary Examiner:
Int. Cl.
CPC ...
G11B 5/31 (2006.01); G11B 20/12 (2006.01); G11B 13/08 (2006.01); G11B 5/012 (2006.01); G11B 5/00 (2006.01);
U.S. Cl.
CPC ...
G11B 13/08 (2013.01); G11B 5/012 (2013.01); G11B 2005/0021 (2013.01);
Abstract
A heat-assisted magnetic recording (HAMR) device is configured to write regions of neutral polarity on a magnetic media during a same pass of the recording head in which other regions are written of positive polarity and negative polarity. The various disclosed write techniques may facilitate creation of 'zero state' (substantially net zero polarity) transition zones between each pair of data bits of opposite polarity and/or may facilitate the encoding of three different logical states (e.g., 1, 0, and −1) on the media.