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Another difference between main and secondary memory is that main memory is usually volatile and secondary is usually nonvolatile. This difference refers to the stored information and the power supply. Volatile means that information is deleted when the power is turned off whereas in the case of nonvolatile the information remains. For example, when a computer is shut down, all the main memory is wiped clean, but thankfully the secondary memory will remain as is!
— Computer Science Principles
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