| 摘要 |
<p>PURPOSE:To handle almost equally with the file of a nonvolatile memory element by providing a function to said volatile file to save all data by single device itself. CONSTITUTION:When the drop-out of the power supply of a system is detected, a microprocessor 2 actuates the reading circuit of a semiconductor memory part 3 of an unloading control part 7 by an unloading interruption indication to prepare for reading. At the same time, a magnetic disk device 4 performs positioning to an index. The first sector ID part (track and sector number) is read out of the part 3, and its normalcy is confirmed. Then a sector component of a disk is read out and then written. The same action is repeated until the final track, and the data within the memory 3 are divided into each fixed sector data length of the disk to read out all data of the memory 3. A flag is written to the control sector part of the disk to secure that the data is unloaded correctly on the disk. Then the power supply is cut off. In the case of a service interruption, the working is maintained with use of a spare accumulator part.</p> |
