| 摘要 |
<p>A dual storage apparatus is provided that comprises first and second memories (1A, 1B) for respectively retaining sets of identical data and a selector (30) for selecting either of the two sets of the data respectively read from the first and the second memory based on a read control signal (101) inputted into the selector, having a request management unit for, when the read control signal has been inputted, attaching an identifier for identifying the read control signal to the inputted read control signal and outputting the signal and the identifier; and a plurality of memory control units (2A1,2A2;2B1,2B2) for each of the first and the second memories (1A, 1B). The dual storage apparatus detects a synchronization error by verifying coincidence of the identifier attached by the request management unit and controls the selector such that the data from a system from which no synchronization error has been detected.
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