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. 23, 2022
Filed:
Feb. 16, 2021
Western Digital Technologies, Inc., San Jose, CA (US);
Pierre-Olivier Jubert, San Jose, CA (US);
Sukumar Rajauria, San Jose, CA (US);
Western Digital Technologies, Inc., San Jose, CA (US);
Abstract
A data storage device is disclosed comprising a head actuated over a magnetic media, wherein the head comprises a write coil and a write pole. A test pattern is written to the magnetic media by applying a first current to the write coil. A second current is applied to the write coil while the head passes over the test pattern, wherein the second current has a polarity opposite the first current. After applying the second current to the write coil while the head passes over the test pattern, the test pattern is read from the magnetic media using the head to generate a first read signal, and a first noise power of the first read signal is measured. A degradation of the write pole is detected based on the first noise power measurement.