STORAGE DEVICE AND MEMORY CONTROL METHOD

PROBLEM TO BE SOLVED: To reduce operating time from abnormal power supply to completion of storage of necessary data. SOLUTION: In a storage device 6, a microprocessor 11, when detecting an abnormality of a power supply, writes at least a part (information on differences between a logical-physical conversion table 142 and a logical-physical conversion table 202) of management information stored in an SDRAM 14 as logical-physical conversion table difference information 152 in an MRAM 15 which is a nonvolatile memory enabling fast writes. When the SDRAM 14 is recovered afterwards, the management information stored in the SDRAM 14 is corrected as necessary using the management information written in the MRAM 15. COPYRIGHT: (C)2010,JPO&INPIT