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:
Oct. 27, 2026
Filed:
May. 23, 2025
Kabushiki Kaisha Toshiba, Tokyo, JP;
Toshiba Electronic Devices & Storage Corporation, Tokyo, JP;
Gabor Szita, Newark, CA (US);
Hengchang Guo, Rancho Santa Margarita, CA (US);
Jiangang Liang, Saratoga, CA (US);
Gary W. Calfee, Santa Clara, CA (US);
Kabushiki Kaisha Toshiba, Kawasaki, JP;
Toshiba Electronic Devices & Storage Corporation, Kawasaki, JP;
Abstract
An in-drive calibration scheme is described for selecting a laser operating current for each write head of a hard disk drive that employs heat-assisted magnetic recording (HAMR). A magnetic head is positioned above a target write region of a magnetic disk, for example, at an inner diameter region. A test servo pattern is then written in the target write region with the magnetic head while the target write region is irradiated by a laser in the magnetic head and the laser operates at a selected laser operating current value. If the test servo pattern fails to meet a quality threshold, the selected laser operating current value is increased, and another servo pattern is written in the target write region.
Data source: USPTO (United States Patent and Trademark Office) public patent records. Weekly synchronization. How IDiyas builds this profile