| 摘要 |
<p><P>PROBLEM TO BE SOLVED: To accurately determine old/new relations, when there are a plurality of physical blocks in which data having the same logical address range is written. <P>SOLUTION: Old/new identification information is constituted by a plurality of circulation numbers having priority. When new old/new identification information is created, comparison is performed in the order from the circulation number having high priority, and old/new identification information having a new old/new relation is extracted. When the old/new identification information having a new old/new relation is extracted, the circulation number having the priority to be compared in extracting the extracted old/new identification information is used as the circulation number having the priority of the new old/new identification information. When all the circulation numbers of the priorities to be compared of the old/new identification information to be compared are the same (including the case where the number of pieces of old/new identification information to be compared is only one), further extraction is not performed, and the circulation number next to the circulation number is used as the circulation number of the priority of the new old/new identification information. <P>COPYRIGHT: (C)2008,JPO&INPIT</p> |
