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 the written data, even when the power is off and a power off {HEAD ~ preserving device} for terminating {TAIL ~ power} to the system after transferring the data held in 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 the written data , even when the power is off and a power off { HEAD ~ preserving device } for terminating { TAIL ~ power } to the system after transferring the data held in the first storing device to the second storing device
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