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4 They hold data used by the They hold data used by the

computer user
5 These are semi-conductor These are magnetic and
memories optical memories

6 They are the main They are used as backup
memories memories

7 They are working memory They are used for storage
of the computer of data in computers

8 Faster than secondary Slower than primary
memories memories

9 Computer can’t run without Computer may run without
primary memories secondary memories

Magnetic Storage Devices

Magnetic storage is any device that manipulates magnetic fields on a medium in

order to record audio, video or other data. Several types of magnetized media are
used in computer systems, including magnetic tape, floppy disks and hard
disk drives. It is a form of non-volatile storage.

Hard Disk Drive

A Hard Disk Drive (often shortened as Hard Disk, Hard Drive or HDD) is a
non-volatile storage device that stores digitally encoded data on rapidly rotating
rigid (i.e. hard) platters with magnetic surfaces.

Hard Disk Drive

It stores all programs and data in the computer. Hence the hard disk is referred to
as the Memory Bank of a computer. The hard disk memory is permanent so
that the programs and data are not lost when the computer is turned off. Hard
drives are secondary storage devices since they are not connected directly to