| 摘要 |
<P>PROBLEM TO BE SOLVED: To enable easy and sure erasure of a stored data in physical manner. <P>SOLUTION: There are provided a data storage means; management tables (IITa/IITb, BLT1a/BLT1b) containing ID of information to be stored, a region information representing a block for storing, and information group representing whether the blocks of the data storage means are in use or not; management means (36 and 41) which search a non-used block based on the information of the management table which is allocated for storing of the information to be stored, update the information of the management table to the one representing the state after allocation, and then erase the information of the management table related to the storage information of the data storage means whose usage is finished; a means (70) for designating an erasure mode of the stored data; and an overwrite means (42) which performs the overwriting process defined in the erasure mode which is designated by the designating means (70) on the block specified by the information, which has changed from in-use to non-use, among the information group representing in-use or non-use after erasure of the information of the management table. <P>COPYRIGHT: (C)2005,JPO&NCIPI |
