what is secondary memory

what is secondary memory

Secondary storage is nonvolatile that is information stored in it is not lost when power is turned off. It is also cost-efficient. It is possible to have a lot of secondary storage for the cost of a little RAM. One reason for this cost differences is speed. A computer transfers instructions and data between the CPU and RAM. These exchanges of instructions and data takes place continually as the computer is used. The computer also transfer instructions and data between RAM and secondary storage. However, these transfers are far less frequent, and hence they do not directly affect the overall performance of the system. Transfers between the CPU and RAM are generally measured in nanoseconds, whereas transfers between secondary storage and RAM are generally measured in milliseconds.

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