Disk drive with cache repeatedly accessed for a read command to

Details Disk drive with cache repeatedly accessed for a read command to Disk drive with cache repeatedly accessed for a read command to

1997-06-26

1999-07-06

Chan, Eddie P.

Electrical computers and digital processing systems: memory

Storage accessing and control

Specific memory composition

711137, 711168, 395825, 395872, G06F 1208

Patent

active

059208872

ABSTRACT:
A method provides for waiting for a cache hit in the operation of a disk drive. The drive has an intelligent interface for communicating with a host, a magnetic disk, and a cache. The cache is divisible into a number of segments, and the cache employs a cache control structure. The drive receives a first command and a second command wherein the second command has a requested data range. The method comprises the steps of: (a) initializing a read in response to the first command to provide prefetch data to the cache in a prefetch data range wherein the prefetch data range has a first logical block address; and (b) waiting for a cache hit in response to the second command wherein the beginning of the requested data is within the prefetch data range and does not request the first logical block address.

REFERENCES:
patent: 4835678 (1989-05-01), Kofuji
patent: 5600817 (1997-02-01), Macon, Jr. et al.
patent: 5664145 (1997-09-01), Apperley et al.
patent: 5822616 (1998-10-01), Hirooka

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