Process and method for erase strategy in solid state disks

Details Process and method for erase strategy in solid state disks Process and method for erase strategy in solid state disks

2008-10-02

2011-10-25

Yu, Jae (Department: 2185)

Electrical computers and digital processing systems: memory

Storage accessing and control

Specific memory composition

C711S154000, C711S161000, C711S162000, C711S165000

Reexamination Certificate

active

08046530

ABSTRACT:
An embodiment of the invention relates to a nonvolatile mass storage device such as a flash memory device formed with erase blocks partitioned into memory management blocks. An erase block is identified containing at least a minimum number of management blocks marked invalid, from which data is copied, merged, and stored in a new management block. The erase block is then erased. Erase blocks containing at least the minimum number of invalid management blocks may be erased until a minimum amount of management blocks is free. Alternatively, all erase blocks containing at least the minimum number of invalid management blocks may be erased. A management table listing the number of invalid management blocks in erase blocks may be included in the mass storage device. Preferably, the new management block for storage of the merged data is located in an erase block different from the identified erase block.

REFERENCES:
patent: 2003/0041210 (2003-02-01), Keays

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