Tag memory disk cache architecture

Details Tag memory disk cache architecture Tag memory disk cache architecture

2005-03-01

2005-03-01

Sparks, Donald (Department: 2187)

Electrical computers and digital processing systems: memory

Storage accessing and control

Specific memory composition

C711S114000, C711S118000, C711S202000

Reexamination Certificate

active

06862660

ABSTRACT:
The present invention is embodied in the disk drive having a cache control system that is configured to efficiently respond to host commands by forming variable length segments of memory clusters for caching disk data in contiguous ranges of logical block addresses without regard to the sequential order of the memory clusters. The cache control system has a tag memory usable only for defining the segments. The tag memory has a plurality of tag records pointing to cluster control blocks associated with the memory clusters for defining the segments. The tag memory may be accessed and updated by several state machines in the cache control system and by a microprocessor in the disk drive.

REFERENCES:
patent: 5875352 (1999-02-01), Gentry et al.
patent: 6018789 (2000-01-01), Sokolov et al.
patent: 6553457 (2003-04-01), Wilkins et al.

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