A RAID system having a plurality of disk devices and a RAID control device for controlling {HEAD ~ the plurality} of {TAIL ~ disk devices}, and storing same data in the plurality of disk devices, the system comprising: 
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A RAID system having a plurality of disk devices and a RAID control device for controlling { HEAD ~ the plurality } of { TAIL ~ disk devices } , and storing same data in the plurality of disk devices , the system comprising :
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