The disk unit includes a plurality of disk units for storing information transmitted from the host unit and a management information recording device, formed by utilizing {TAIL ~ information storage areas} in the disk units, for causing information relating to a logical unit for storing {HEAD ~ information} from the host unit to correspond to information relating to the units 
The disk unit includes a plurality of disk units for storing information transmitted from the host unit and a management information recording device , formed by utilizing { TAIL ~ information storage areas } in the disk units , for causing information relating to a logical unit for storing { HEAD ~ information } from the host unit to correspond to information relating to the units
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