| http://www.w3.org/ns/prov#value | - When the above-mentioned read and write operation on the first track of the spare disk drive 709 belonging to the logical device 70 N is completed, such operations as a read and write operation of the aforementioned data having a specific pattern and of error-detecting code, and an error detection are carried out on the next track on the spare disk of the spare disk drive 709 belonging to the logi
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