Electrical computers and digital processing systems: memory – Storage accessing and control – Specific memory composition
Reexamination Certificate
2007-01-17
2009-10-27
Thai, Tuan V (Department: 2185)
Electrical computers and digital processing systems: memory
Storage accessing and control
Specific memory composition
C711S113000
Reexamination Certificate
active
07610438
ABSTRACT:
A flash-memory cache card caches data that a host writes to a hard disk drive. A flash-memory array has physical blocks of flash memory arranged into first and second data areas having M blocks each, and a wear-leveling-counter pool. An incoming logical sector address (LSA) from a host is mapped to one of M entries in a RAM lookup table using a hash of modulo M. The RAM entry stores a mapping to a physical block in a foreground area that is either the first or the second data area. Pages in the physical block are read for a matching LSA that indicates a cache hit. Full pages are written back to the hard disk and erased in the background while the other data area becomes the foreground area. A new physical block with a low wear-level count is selected from blocks in the new foreground area.
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Lee Charles C.
Lee Edward W.
Shen Ming-Shiang
Yu I-Kang
Auvinen Stuart T.
Dinh Ngoc V
gPatent LLC
Super Talent Electronics Inc.
Thai Tuan V
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