What is Secondary Memory

 


Secondary Memory

All secondary storage devices which are capable of storing high volume data is referred to secondary memory. It's slower than primary memory. However, it can save a substantial amount of data, in the range of gigabytes to terabytes. This memory is also called backup storage or mass storage media.


Types of Secondary memory

Mass storage devices:

The magnetic disk provides cheap storage and is used for both small and large computer systems.


Two types of magnetic disks are:


Floppy disks

Hard disks

Flash/SSD

Solid State Drive provides a persistent flash memory. It's very fast compared to Hard Drives. Frequently found in Mobile phones, its rapidly being adopted in PC/Laptop/Mac.


Optical drives:

This secondary storage device is from which data is read and written with the help of lasers. Optical disks can hold data up to 185TB.


Examples


CD

DVD

Blue Ray

USB drives:

It is one of the most popular types of secondary storage device available in the market. USB drives are removable, rewritable and are physically very small. The capacity of USB drives is also increasing significantly as today 1TB pen drive is also available in the market.


Magnetic tape:

It is a serial access storage device which allows us to store a very high volume of data. Usually used for backups.


Characteristic Secondary Memory

These are magnetic and optical memories

Secondary memory is known as a backup memory

It is a non-volatile type of memory

Data is stored permanently even when the power of the computer is switched off

It helps store data in a computer

The machine can run without secondary memory

Slower than primary memory

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