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:
Dec. 03, 2002
Filed:
Nov. 24, 1999
International Business Machines Corporation, Armonk, NY (US);
Abstract
A disk drive with the ability to detect errors caused by thermal asperities and assign alternate sectors is described. One of a plurality of error recovery procedures is executed after turning off a signal filter which normally removes a set of low frequencies from the output signal from the head. The unfiltered signal is used to judge whether a thermal asperity caused the error. If it is determined that a thermal asperity caused the error, the sector is marked as defective and an alternate sector is assigned even if other error recovery procedures are able to read the sector. The reliability of the drive is enhanced by removal of sectors from use which have temporarily recoverable errors caused by thermal asperities.
Data source: USPTO (United States Patent and Trademark Office) public patent records. Weekly synchronization. How IDiyas builds this profile