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:
Aug. 05, 2003
Filed:
Dec. 28, 1999
Karl Gong, San Jose, CA (US);
Bernd Lamberts, Cupertino, CA (US);
Thomas Earl Stanley, Gilroy, CA (US);
International Business Machines Corporation, Armonk, NY (US);
Abstract
A method and apparatus for monitoring track misregistration that is quicker and that is not limited to worst case assumptions. The present invention includes a first memory for accumulating position error signals for a head to produce an accumulated value, a processor for normalizing the accumulated value to produce a normalized result at a predetermined trigger event and a second memory for adding the normalized result therein to produce a running sum; wherein the head is positioned using the running sum. The processor resets the first memory when the normalized result is produced. A counter is provided for incrementing a count value after each position error signal is added to the first memory. The processor normalizes the accumulated value according to the count value of the counter, and the processor resets the counter as a result. In addition, the processor may normalize the accumulated value according to a population mean and a variance associated with the data storage system. The trigger event may include the accumulated error value reaching a predetermined threshold or a servo seek to the next track. The process may be initiated using a self-test command.