Static wear leveling

Details Static wear leveling Static wear leveling

2009-04-20

2011-11-22

Mai, Son (Department: 2827)

Electrical computers and digital processing systems: memory

Storage accessing and control

Specific memory composition

C711S154000, C711S165000

Reexamination Certificate

active

08065469

ABSTRACT:
Methods for extending the service life of a data storage device and devices operable to perform those methods are presented. A master lookup table block may comprise lookup table blocks and store an erase count indicator for each lookup table block. Each lookup table block may be associated with a logical zone of a memory and comprise entries. Each entry may be associated with a logical block and comprise an erase count for a physical block corresponding to that logical block. A physical block erasure may be performed on a first physical block in the memory. The physical block erasure may be tracked by incrementally increasing a first erase count. An actual erase count may be determined for the first physical block. The entry for a logical block corresponding to the first physical block may be exchanged with another entry within a different lookup table block when the actual erase count for the first physical block exceeds a threshold. The different lookup table block may have a lower erase count indicator relative to that of the lookup table block comprising the entry for the logical block corresponding to the first physical block.

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