| 摘要 |
<P>PROBLEM TO BE SOLVED: To manage a shift direction of a storage area. <P>SOLUTION: A storage device includes storage control means that re-writes a divided data piece stored in a valid storage area onto an invalid storage area, sets a valid flag to a second storage area corresponding to the write destination invalid storage area and an invalid flag to the second storage area corresponding to the write origin valid storage area to shift a position of the invalid storage area in plural first storage areas and to complete re-write of all divided data pieces until the number of times of reading data reaches the limit of the number of times of reading of a first storage unit, and determines a shift direction of the invalid storage area on the basis of the flags for identifying validity/invalidity. <P>COPYRIGHT: (C)2012,JPO&INPIT |
