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:
Nov. 18, 2014
Filed:
May. 09, 2013
Western Digital Technologies, Inc., Irvine, CA (US);
Noureddine Kermiche, Dana Point, CA (US);
Xianghui Xiao, Irvine, CA (US);
Scott A. St. John, Trabuco Canyon, CA (US);
Western Digital Technologies, Inc., Irvine, CA (US);
Abstract
A disk drive is disclosed comprising a head actuated over a disk comprising a plurality of tracks. The head comprises a touchdown element operable to generate a touchdown signal. The touchdown signal is amplified by a gain to generate an amplified touchdown signal, and a touchdown event is detected by comparing the amplified touchdown signal to a threshold. During a calibration operation, the gain is adjusted and the threshold is adjusted until the amplified touchdown signal does not exceed the threshold. During a normal operation, the touchdown event is detected based at least partly on the adjusted gain and the adjusted threshold.