| 摘要 |
PURPOSE:To guarantee the matching of data inside a backup memory to the instantaneous stop or interruption of a power source by the unit of a sector. CONSTITUTION:A corresponding means for making a data control table correspond to a sector where data is actually stored, a first judging means for judging whether the data is valid or invalid at every data of the unit of the sector where data is preserved and a second judging means for judging a storing operation state to the backup memory 3 at the time of the instantaneous stop or interruption of the power source are provided inside the backup memory 3. Then, data where mismatching is generated becomes invalid and data which is precedingly preserved becomes valid. |
