STORAGE DEVICE AND MEMORY CONTROLLER

WIPO Patent Application WO/2011/068109

A1

Disclosed is a storage device using non-volatile semiconductor memory that achieves high performance and long life for the device. When managing the non-volatile semiconductor memory (2), physical blocks are divided into three types: scratch blocks (22), data blocks (23), and deleted blocks (24). Data writing from a host device (3) is performed on the scratch blocks. When the number of empty pages within a scratch block becomes less than a predetermined number or no longer exists, the block is treated thereafter as a data block, and one of the deleted blocks is newly assigned as a scratch block. If there are insufficient deleted blocks, a block with relatively less valid data is selected from among the data blocks. After copying all valid data included in the block to a scratch block, the block is deleted, and thus a deleted block is acquired.

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NISHI MASATAKA (JP)
FUJITA RYO (JP)
INADA RYOICHI (JP)
NISHIMURA TAKUMA (JP)
SHIRAISHI MASAHIRO (JP)
MATSUDA KOJI (JP)

PCT/JP2010/071429

June 09, 2011

December 01, 2010

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HITACHI LTD (JP)
NISHI MASATAKA (JP)
FUJITA RYO (JP)
INADA RYOICHI (JP)
NISHIMURA TAKUMA (JP)
SHIRAISHI MASAHIRO (JP)
MATSUDA KOJI (JP)

G06F12/00; G06F12/02; G06F12/16

WO2007013372A1

2007-02-01

JP2008146254A	2008-06-26
JP2004078902A	2004-03-11
JPH0527924A	1993-02-05
JP2008217208A	2008-09-18
JP2007334852A	2007-12-27
JP2002513484A	2002-05-08

ISONO Michizo (JP)
Michizo Isono (JP)

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