| 摘要 |
In an OTP memory, initially, a file A is recorded. When modification of the file A is needed, a modification file B is additionally written into the OTP memory. Storage information on the modification file B is also additionally written into a FAT area and a directory entry. When an application program issues a read request for the file A, a file system refers to the FAT area and the directory entry to recognize the existence of the modification file B and reads the file A and the modification file B out from a data area. Then, the file system modifies the file A on the basis of the modification file B and stores a modified file into a RAM. The application program accesses the file which is stored in the RAM.
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