{HEAD ~ The control unit} of a computer system comprises a first storing device for holding written data while the power is on, {TAIL ~ a second storing device} for holding 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 the first storing device to the second storing device 
{ HEAD ~ The control unit } of a computer system comprises a first storing device for holding written data while the power is on , { TAIL ~ a second storing device } for holding 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 the first storing device to the second storing device
HEAD HEAD HEAD HEAD HEAD HEAD HEAD 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 TAIL TAIL OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH