Method for static wear leveling in non-violate storage device

1. A method for static wear leveling in non-violate storage device, comprising the steps of:

step SA 01 : recording occupied count and erasure count of each physical block in the non-violate storage device;

step SA 02 : judging if a controller issues an erase command to the non-violate storage device;

step SA 03 : incrementing the erasure count of an erasure block by one while data is erased from the erasure block according to the erase command;

step SA 04 : incrementing the occupied count of an occupied block by one while data is written to the occupied block;

step SA 05 : triggering wear leveling while the difference between the highest occupied count of a non-occupied block and the lowest erasure count of the occupied block exceeds a predetermined value;

step SA 06 : choosing a block having higher occupied count and lower erasure count to move; and

step SA 07 : moving data stored in the block chosen in step SA 06 .

2. The method as claimed in claim 1 , wherein the erasure counts of all physical blocks are recorded in an erasure count block, and the controller adds one to the erasure count corresponding to an address of each physical block if the erase command is issued.

3. The method as claimed in claim 2 , wherein the occupied counts of all occupied physical blocks are recorded in an occupied count block, the occupied count shows how many times an erase command is issued to erase other blocks and not the occupied blocks, the controller adds one to the occupied counts of all occupied physical blocks except for the erasure block if the erase command is issued, and the controller resets the occupied count of the erasure block to zero.