Persistent data is data that remains after a program has finished.
On desktop machines, it is conventional to refer to data on a disk file as persistent, because it persists after the machine has been turned off.
Data in RAM is volatile, because it is lost when power is removed. On a Symbian platform device, these distinctions are less clear (because the “disk” is itself in RAM). It is, nevertheless, useful to refer to data in files as persistent.
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