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:
May. 13, 2025
Filed:
Jun. 13, 2024
Western Digital Technologies Inc., San Jose, CA (US);
Mehdi Habibollahzadeh, San Jose, CA (US);
Sukumar Rajauria, San Jose, CA (US);
Western Digital Technologies, Inc., San Jose, CA (US);
Abstract
Various illustrative aspects are directed to a data storage device comprising one or more disks; one or more heads, including a first head having a first laser diode and a near field transducer; and one or more processing devices configured to: preheat the first LD to a steady state temperature; write a first and a second series of writings at a plurality of thermal fly-height control powers, wherein the first and the second series of writings are written at the steady state temperature, and the first series of writings are of a shorter duration than the second series of writings; determine, for the first head, an NFT protrusion measurement based at least on a difference in TFC power used between (1) one of the first of writings and (2) one of the second series of writings, at a corresponding written signal amplitude.