RECORDING AND REPRODUCING DEVICE, CONTROLLER THEREFOR AND DATA PROTECTING METHOD

摘要

PROBLEM TO BE SOLVED: To prevent erasure disturbance in a flash memory. SOLUTION: When a file system 101 is powered on, ECC error detection of flash memories 102 and 103 is performed. If an error is found during a read of data to a host, error detection regarding other sectors (sectors in the same mat) connected to the same source line with the sector where the error is found is performed. Further, the cumulative erasure time (or frequency) of each sector is counted and when one sector reaches a guarantee erasure frequency, ECC error detection is performed as to all the sectors in the same mat connecting to the same source line with the sector. This error detection is performed by using an ECC detecting circuit 1042 and an ECC generating circuit 1041 in combination.