| http://www.w3.org/ns/prov#value | - power supply is restarted, data (D1, D2, D3) belonging to the same parity group is read out from disk devices other than a disk device, in which data is to be updated, and a disk device for storage of parity, new parity (Dp new) 48-1 is generated from the data (D1, D2, D3) and new data (D0 new) 40 stored in the nonvolatile memory 34, the new parity (Dp new) 48-1 and new data (D0 new) 40 are writte
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