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 information storage areas in the disk units, for causing {TAIL ~ information} relating to a logical unit for storing information from {HEAD ~ 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 information storage areas in the disk units , for causing { TAIL ~ information } relating to a logical unit for storing information from { HEAD ~ the host unit } to correspond to information relating to the units
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