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Primary memory is the main memory of the computer. This is subdivided in to RAM (Ransdom access memory) and ROM ( Read-Only memory - used for storing loading instruections by manufacturer - BIOS ).

RAM is used for temporary storage and volatile in nature. All datas will be get erased on power off.

All instruction to the CPU is loaded in the main memory once the OS and applications are initaited .

In between processor and main memory cache memory ( in-built in processor chip) to make the access speed fast.

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