A separate power supply which may be a charged capacitor is used to power the memory and memory lock circuits in {TAIL ~ case} of {HEAD ~ a power interruption} in the main system with which the memory is being used, so that volatile data can be stored for re use by the main system after the main power is restored 
A separate power supply which may be a charged capacitor is used to power the memory and memory lock circuits in { TAIL ~ case } of { HEAD ~ a power interruption } in the main system with which the memory is being used , so that volatile data can be stored for re use by the main system after the main power is restored
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