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Introduction

Main memory is a temporary storage unit that directly interacts with the CPU, with data transfer between the CPU and main memory being managed by the cache memory. In contrast, secondary memory is permanent storage, and data transfer between secondary and primary memory is handled by an I/O processor. Let us see the differences between main memory and secondary memory, highlighting their roles, characteristics, and significance in computer systems.

Differences between main memory and secondary memory

Main memory	Secondary memory
Main memory is also known as primary memory or internal memory stores data temporarily	Secondary memory is also known as auxiliary memory or external memory stores data permanently
It can directly access data by processor/ CPU	It cannot directly access data by processor/CPU
The nature of Parts of the main memory varies, RAM- is volatile in nature. ROM- Non-volatile.	Secondary memory is always non-volatile in nature
Memory is stored in semiconductor chips	Memory is stored in an external storage device such as hard disks, pen drives, etc
This memory has a fast access time	This memory has low access time.
It is expensive	It is inexpensive
Examples of main memory are: RAM and ROM	Examples of secondary memory are: magnetic disks, magnetic tapes, etc