In a disk array unit, it is not necessary to make all magnetic disk units operating, in the case where {TAIL ~ the number} of {HEAD ~ accesses} from the host unit is not many 
In a disk array unit , it is not necessary to make all magnetic disk units operating , in the case where { TAIL ~ the number } of { HEAD ~ accesses } from the host unit is not many
OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH TAIL TAIL TAIL TAIL TAIL TAIL OTH HEAD HEAD HEAD HEAD HEAD OTH OTH OTH OTH OTH OTH OTH