| 摘要 |
<P>PROBLEM TO BE SOLVED: To provide a flash disk drive whose lifetime is prevented from dropping by equalizing the number of rewriting times in order to eliminate a frequent change in address table contents and suppress an increase in the number of rewriting times in a specified area. <P>SOLUTION: A free area for data storage is prepared in advance on a flash memory 20 regardless of a logical address designated from a host machine 1, and write data from the host machine 1 is sequentially written. Although a block 21 whose data becomes invalid is erased in the background in parallel with the sequential writing, an address table 30 holding the relation between a logical address and a physical address is then stored in a nonvolatile memory 12 rewritable in a word unit, such as a RAN. <P>COPYRIGHT: (C)2005,JPO&NCIPI |
