| 摘要 |
PROBLEM TO BE SOLVED: To provide a semiconductor storage device usable for the same command set or an interface from a host system and having different properties, a read only type, a write once type, and rewrite type; and to prolong life by reducing a concentration on write/erase operations to the same region in the rewrite type. SOLUTION: A file is managed by a UDF (Universal Disk Format) file system 42 equipped in a host computer 4. Where, card type memories 1a, 1b, 1c, each consists of a storage section having at least a given-capacity storage area and a control section decoding a command issued by a host system and controls in the bulk the storage section; the storage area is formatted with a Universal Disk Format (UDF) having a user data area per sector of 2048 bytes and a logical sector length of 2048 bytes. COPYRIGHT: (C)2006,JPO&NCIPI
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