In the case where time of twenty four hour clock is registered in the “diagnosis start time” 270, {HEAD ~ the diagnosis} of {TAIL ~ the spare magnetic disk unit} 191 may be conducted when the registered time has been reached 
In the case where time of twenty four hour clock is registered in the “ diagnosis start time ” 270 , { HEAD ~ the diagnosis } of { TAIL ~ the spare magnetic disk unit } 191 may be conducted when the registered time has been reached
OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD REL TAIL TAIL TAIL TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH