Electrical computers and digital processing systems: memory – Storage accessing and control – Specific memory composition
Reexamination Certificate
2006-02-07
2006-02-07
Sparks, Donald (Department: 2187)
Electrical computers and digital processing systems: memory
Storage accessing and control
Specific memory composition
C711S118000, C711S202000
Reexamination Certificate
active
06996669
ABSTRACT:
The present invention relates to a disk drive including a cache memory having a plurality of sequentially-ordered memory clusters for caching disk data stored in sectors (not shown) on disks of a disk assembly. The disk sectors are identified by logical block addresses (LBAs). A cache control system of the disk drive comprises a cluster control block memory, having a plurality of cluster control blocks (CCB), and a tag memory22, having a plurality of tag records, that are embedded within the cache control system. Each CCB includes a cluster segment record with an entry for associating the CCB with a particular memory cluster and for forming variable length segments of the memory clusters without regard to the sequential order of the memory clusters. Each tag record assigns a segment to a continuous range of LBAs and defines the CCBs forming the segment. Each segment of the memory clusters is for caching data from a contiguous range of the logical block addresses. The cache control system efficiently exploits available memory clusters for responding to host commands.
REFERENCES:
patent: 5561786 (1996-10-01), Morse
patent: 5875352 (1999-02-01), Gentry et al.
patent: 6018789 (2000-01-01), Sokolov et al.
patent: 6606682 (2003-08-01), Dang et al.
Castro Ralph H.
Dang Quoc N.
Ng Tsun Y.
Wilkins Virgil V.
Fawcett, Esq. Robroy R.
Peugh Brian R.
Shara, Esq. Milad G.
Sparks Donald
Western Digital Technologies Inc.
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