Flash-memory card for caching a hard disk drive with data-area toggling of pointers stored in a RAM lookup table
Number of patents in Portfolio can not be more than 2000
United States of America Patent
Stats
-
Oct 27, 2009
Grant Date -
May 24, 2007
app pub date -
Jan 17, 2007
filing date -
Jan 6, 2000
priority date (Note) -
In Force
status (Latency Note)
Importance
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.
First Claim
Family
International Classification(s)
Cited Art Landscape
Patent Citation Ranking
Advertisement
Advertisement
Advertisement
Recipient Email Address
Recipient Email Address
Comment
Recipient Email Address
Add to Portfolio(s)
To add this patent to one, or more, of your portfolios, simply click the add button.
This Patent is in these Portfolios:
Add to additional portfolios:
Last Refreshed On:
Changes done successfully