To automatically and quickly restore residual data in another medium, without depending on help or job re-execution, even when data destruction is generated due to a hardware error or software error.

This device is provided with a recognition processing part 51 for recognizing a damaged part generated, due to a hardware error or a software error in a sequential access storage medium 40, a restoration processing part 52 for operating restoration processing corresponding to the damaged part recognized by the recognition processing part 51, and a writing processing part 53 for writing the restored result from the restoration processing part 52 in other media 26 and 42.