| 摘要 |
PURPOSE:To correctly and rapidly execute recovery by returning data to a state before an additional storing processing is carried out according to an address at the time of abnormally completion during the additional storing processing. CONSTITUTION:The data (a) is stored in a file A and the last address of the data (a) at this time is stored in a memory C. Added data (b) is stored immediately after the last address of the data (a) and the data (b) remains without constantly being erased. When the additional storing processing is normally completed, a file B can be stored and erased. At the time of abnormal completion, a storing part 2 is erased from the file A based on the address stored in the memory C and the file B is returned to an original state. According to this processing, the data is returned to the state before the additional storing processing is carried out.
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