Electrical computers and digital processing systems: memory – Storage accessing and control – Specific memory composition
Patent
1997-06-26
1999-03-30
Bragdon, Reginald G.
Electrical computers and digital processing systems: memory
Storage accessing and control
Specific memory composition
711137, G06F 1208
Patent
active
058902112
ABSTRACT:
A method of operating a disk drive having a cache provides for adapting the amount of prefetch. The drive also has an intelligent interface for communicating with a host, and a magnetic disk. The cache is divisible into a number of segments, and employs a cache control structure including a cache array with a cache array entry. When the drive receives a first command, the method provides a step of performing a scan of the cache to assign the first command to a segment. The method further includes the step of maintaining the cache array with a cache array entry for each one of the number of segments, where each cache array entry classifies a segment by a cache access type, wherein the cache access type is selected from a plurality of access types including sequential and random. The method further includes the step of determining a limit on the amount of prefetch based on the cache access type for the first command and a cache environment variable. The limit may be a minimum prefetch or a maximum prefetch.
REFERENCES:
patent: 5313585 (1994-05-01), Jeffries et al.
patent: 5381539 (1995-01-01), Yanai et al.
patent: 5623608 (1997-04-01), Ng
patent: 5752263 (1998-05-01), Kranich
Sokolov Daniel John
Swatosh Timothy
Bragdon Reginald G.
Kim Chris
Shara Milad
Western Digital Corporation
Young Leo J.
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