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Secondary memory devices are also called secondary storage devices. They are
categorised into three types:
Secondary Storage Devices
Magnetic Disk Optical Disc Flash Drive
Hard Disk CD DVD Blu-ray Disc Pen Drive Memory Card
Magnetic Disk
A device, such as a a hard disk is covered with a magnetic coating. You can record
and erase data on a magnetic disk any number of times.
Hard disk
The hard disk consists of one or more magnetic disks
called platters. Each disk in the pack has top and bottom
surfaces on which data is recorded using magnetic head.
It is permanently fixed in the system unit. It is usually used
for permanent mass storage. The most important function
of the hard disk is to store program files and data files. Hard disk
The hard disk comes in a variety of sizes with storage
capacities as high as 5 TB (TeraByte) or even more. The CPU
accesses data stored on a hard disk much faster than it can
access data on a CD.
External hard disks are also available. They are the hard
disks that can be connected to any computer with the help
of USB port.
External hard disk
Clickipedia
First hard disk was introduced by Seagate in 1979 which could hold 5 MB of data.
Optical Disc
An optical disc is an electronic data storage medium that can be written to and
read using a low powered laser beam.
Compact Disc (CD)
The CD drive reads information stored on a compact disc
(CD). CD is an external storage device. The lifespan of optical
CD-Drive
Fundamentals of a Computer 15

