Data accessing method for flash memory storage device having data perturbation module, and storage system and controller using the same

CAFC
  • US 8,176,267 B2
  • Filed: 09/15/2008
  • Issued: 05/08/2012
  • Est. Priority Date: 07/09/2008
  • Status: Active Grant
First Claim
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1. A data accessing method, suitable for a flash memory storage device having a data perturbation module, wherein a flash memory of the flash memory storage device has a plurality of physical blocks, and the physical blocks are grouped into at least a data area and a spare area, the data accessing method comprising:

  • receiving a read command from a host, and obtaining a logical block to be read and a page to be read from the read command;

    determining whether a physical block in the data area corresponding to the logical block to be read is a new block;

    transmitting a predetermined data to the host when the physical block corresponding to the logical block to be read is the new block; and

    decoding data read from the physical block corresponding to the logical block to be read by the data perturbation and transmitting the decoded data to the host when the physical block corresponding to the logical block to be read is not the new block.

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