| 摘要 |
<P>PROBLEM TO BE SOLVED: To provide a semiconductor storage device that can prevent a sudden reduction in operating speed. <P>SOLUTION: A memory card 1 executes at staggered times the processing of erasing an old BMAP, the processing of erasing a first old SMAP and a second old SMAP and the processing of erasing old data blocks as wear leveling processing, and can thereby avoid continuous execution in a short time of the high load processing of erasing the old BMAP, processing of erasing the first old SMAP and the second old SMAP and processing of erasing old data blocks as wear leveling processing, to prevent a sudden reduction in operating speed. <P>COPYRIGHT: (C)2006,JPO&NCIPI |
