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:
Mar. 30, 1999
Filed:
Dec. 03, 1997
Daniel John Sokolov, Rochester, MN (US);
Western Digital Corporation, Irvine, CA (US);
Abstract
A method provides for adaptively aging cache segments in a segmented cache in a disk drive. The disk drive receives commands via an intelligent interface from a host. The drive has a magnetic disk. The cache employs a cache control structure including cache parameters, wherein each segment has a scan count of the number of scans of a segment and an access type, and wherein the cache parameters include a maximum number of misses to indicate the maximum number of times a segment will be scanned without a cache hit. A scan count is maintained for each segment while processing commands from the host. The maximum number of misses is adaptively adjusted based on the access type of the cache segments. The scan count for a segment is compared to the maximum number of misses to determine if the segment should be aged out.