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:
Mar. 25, 2008
Filed:
Apr. 28, 2006
Victor Rudman, Santa Clara, CA (US);
Jagdeep S. Buttar, Fremont, CA (US);
Yogesh P. Kharady, Fremont, CA (US);
Tao Pan, San Jose, CA (US);
Victor Rudman, Santa Clara, CA (US);
Jagdeep S. Buttar, Fremont, CA (US);
Yogesh P. Kharady, Fremont, CA (US);
Tao Pan, San Jose, CA (US);
Western Digital (Fremont), LLC, Fremont, CA (US);
Abstract
A method monitors operation of a disk drive. The method includes providing a disk drive which includes a rotating disk and a head having a read transducer in proximity to a surface of the disk and an adjustment mechanism which controllably adjusts an average relative spacing between the read transducer and the surface. The method further includes generating a read-back signal by reading from the surface using the read transducer. The read-back signal includes a high frequency carrier signal having an envelope that is modulated by a lower frequency signal. The method further includes varying the average relative spacing between the read transducer and the surface using the adjustment mechanism. The method further includes analyzing the envelope in the frequency domain and detecting an emergence of at least one frequency component of the envelope within an air bearing resonance range of frequencies.