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:
Jul. 21, 2026
Filed:
Dec. 11, 2024
Western Digital Technologies, Inc., San Jose, CA (US);
Sukumar Rajauria, San Jose, CA (US);
Cliff Zhang, San Jose, CA (US);
Joey M. Poss, Rochester, MN (US);
Western Digital Technologies, Inc., San Jese, CA;
Abstract
A data storage device comprises a disk and a recording head. The recording head comprises a write thermal sensor, a read thermal sensor, and a laser configured for heat assisted magnetic recording (HAMR). Control circuitry shapes a bias signal applied to the read thermal sensor to mirror a thermal response of the write thermal sensor during laser operation, generates a differential signal based on a difference between the write thermal sensor response and the read thermal sensor response, and monitors the differential signal to detect laser mode hopping.