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. 21, 2002
Filed:
Jul. 13, 1999
Roy L. Wood, Yukon, OK (US);
Jason D. Gregg, Oklahoma City, OK (US);
Seagate Technology, LLC, Scotts Valley, CA (US);
Abstract
Apparatus and method for improved operational performance of a disc drive by temporarily decreasing disc rotational velocity to reduce self-excited mechanical resonance established within the drive. The disc drive is first initialized by applying current to the spindle motor to accelerate the disc from rest to a nominal operational rotational velocity. Once initialized, the disc drive is operated in a normal mode, as the temperature of the drive increases from an initial, ambient temperature to an equilibrium temperature. During such operation, when the disc drive detects the presence of a self-excited mechanical resonance, the disc drive proceeds to temporarily decrease the rotational velocity of the disc to a reduced velocity to reduce the effects of the self-excited mechanical resonance. Thereafter, the rotational velocity of the disc is restored to the nominal velocity provided the self-excited mechanical resonance is no longer detected.