| 摘要 |
PROBLEM TO BE SOLVED: To find ways to increase vacant memory cells using a limited number from an operational standpoint, in view of the fact that, if a semiconductor disk device is installed as a storage region of an information processor, the reliability of data could deteriorate due to the life of memory cells and that there is a limit to the number of memory parts to be installed, despite the need to increase the number of vacant memory cells in order to prolong the life. SOLUTION: This control method includes recording written data information such as the number of writes to a physical position and a logical position of a memory cell when data is written. After a physical/logical position control part 105 determines a physical position where a write is made, a recording method control part 106 determines a recording method that matches the frequency of data updates. Data is written according to this determination, and a function to preferentially allocate vacant memory cells to data with high frequencies of updates is newly provided. COPYRIGHT: (C)2011,JPO&INPIT
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