| 摘要 |
Even when a failure incapable of being detected by a single guarantee code occurs in data, a storage controller of the present invention can detect and restore this failure. The controller, upon receiving a write command from a host, establish a first data guarantee code in the write data, and establish a second data guarantee code in the parity related to the write data. Upon receiving a read command from the host, the controller determines the correctness of the data based on the first data guarantee code, and also detects the presence or absence of a failure by comparing the first data guarantee code with the second data guarantee code. When a failure is detected, the controller restores the failure on the basis of RAID technology.
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