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:
Feb. 11, 2014
Filed:
Aug. 17, 2011
Bruno Marchon, Palo Alto, CA (US);
Kazuhiro Saito, San Jose, CA (US);
Roger Wood, Gilroy, CA (US);
Bruce Wilson, San Jose, CA (US);
Bruno Marchon, Palo Alto, CA (US);
Kazuhiro Saito, San Jose, CA (US);
Roger Wood, Gilroy, CA (US);
Bruce Wilson, San Jose, CA (US);
HGST Netherlands B.V., Amsterdam, NL;
Abstract
Methods and systems for measuring variations in head-disk clearance in a hard disk drive. User generated data is randomly selected at a controller of the hard disk drive wherein the user generated data is stored on a disk associated with the hard disk drive. A reference point associated with the user generated data is stored on a storage medium associated with the hard disk drive. The user generated data is read at the controller. The user generated data is analyzed with the reference point using more than two frequencies, at the controller, to obtain a variation in measurement of the head-disk clearance.