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. 20, 2003
Filed:
Oct. 29, 1999
Gregory Michael Frees, Los Altos, CA (US);
International Business Machines Corporation, Armonk, NY (US);
Abstract
The fundamental vibration or butterfly mode sensitivity of a hard disk drive,is significantly dependent on the operating temperature of the drive. The temperature of the drive is readily determined via measurement with a thermal or coil resistance sensor. The sensor provides the drive's servo controller with the drive temperature. The current operating temperature of the disk drive, in combination with its modal sensitivity to thermal changes, are used to regularly update the servo controller. With this information, the servo controller calculates new butterfly mode characteristics as the operating temperature changes in order to actively compensate for the mode, and thus increase the performance of the disk drive.