what is secondary memory

what is secondary memory

Secondary memory, also known as external memory or non-volatile, is slower than main memory but can be used for storing data/information permanently. CPU access these memories via input-output routines for they are not accessed by the CPU directly. In order to access the data in secondary memory, contents of it are first transferred to main memory, and then accessed by the CPU. Examples of secondary memory are: any hard disk or hard drive, pen drive or any kinds of flash drive, CD-ROM, DVD etc.

Features of Secondary Memory:

These are magnetic and optical memories

It is known as backup memory.

It is non-volatile memory.

secondary memory can permanently stored data if even power is switched off.

It is used for permanent storage of any data in a pc.

Computer may run without secondary memory.

Slower than primary memories.

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