| http://www.w3.org/ns/prov#value | - In addition, in a case where there is a need to recover data by using parity in the optical disk D5 for parity recording as there is a disabled optical disk among the optical disks D1 to D4 for data recording which records data of data file corresponding to the occurred reading request, it is preferable to allocate the optical disk drive devices such that it is possible to read out data from all t
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