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