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:
Sep. 11, 2001
Filed:
May. 19, 1999
Michael S. Rothberg, Foothill Ranch, CA (US);
Jonathan Lee Hanmann, Anaheim, CA (US);
Western Digital Technologies, Inc., Lake Forest, CA (US);
Abstract
A disk drive that includes a disk defining a multiplicity of sectors operates in accord with a method comprising the steps of providing a firmware-controlled state machine which can be in any of a plurality of states including an off-line in-progress state. While the state machine is in the off-line in progress state; a firmware-controlled scan of the multiplicity of sectors is performed. While performing the firmware-controlled scan, steps are performed to maintain a list of sector identifiers such that each sector identifier in the list points to a sector that has failed, preferably repeatedly, to provide valid data on the fly. While the state machine is not in the offline in-progress state; the drive responds to a request to write data at a specified sector by determining whether the specified sector matches a sector identifier in the list, and if so, autonomously performing a read-verify-after-write operation.