The control unit of a computer system comprises a first storing device for holding written data while the power is on, a second storing device for holding {TAIL ~ the written data}, even when the power is off and a power off preserving device for terminating power to the system after transferring the data held in {HEAD ~ the first storing device} to the second storing device 
The control unit of a computer system comprises a first storing device for holding written data while the power is on , a second storing device for holding { TAIL ~ the written data } , even when the power is off and a power off preserving device for terminating power to the system after transferring the data held in { HEAD ~ the first storing device } to the second storing device
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