| http://www.w3.org/ns/prov#value | - A storage system in accordance with claim 1, wherein the disk drive device has a plurality of operating modes including an up operating mode and a down operating mode, in the up operating mode, the disk drive device operates in a state closer to a state when the disk drive device is reading or writing data than in the down operating mode, responsive to a reference request for the result of the tes
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