Information processing system having a floppy disk drive with disk protection during a resume mode

摘要

Data destruction resulting from the conversion of a floppy disk can be prevented during a low-power consumption mode in which the FDD is powered off. The present invention is also designed to prevent data destruction resulting from the conversion of a floppy disk during a low-power consumption mode in which an FDC and an FDD are stopped. In the process of returning to a normal operation mode, an I/O address showing a change line status register of the FDC is set to a stored register of the trap logic (status 173). When the process returns to the normal operation mode and an access to the first status register is trapped, a change line status flag value is rewritten (status 174). The faked OS/driver invalidates the floppy disk allocation information in the main memory.