Of main memory backup method and data protection system

PROBLEM TO BE SOLVED: To provide a data protection system of a main memory capable of protecting data stored in a main memory from hang up. SOLUTION: A CPU 11 operates in a protect mode or SMM. A main memory 15 secures a RAM disk area to be accessed from an exclusive driver 113. An application 101 periodically performs setting operation of a monitor flag in the protect mode. When a BIOS 107 determines that a monitor program does not set the monitor flag after transition to SMM, data stored in the RAM disk area is saved in an HDD 23. When it is determined that a prescribed action is performed, the application 101 continues the setting operation of the monitor flag after transition to the protect mode. COPYRIGHT: (C)2012,JPO&INPIT