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Hard Disk
The hard disk is permanently fixed in the system unit. It is used to
store large amount of data.
Hard Disk
Info Byte
Hard disks that can be used as an external storage device are known as external
hard disks.
Compact Disc (CD)
The CD drive reads information stored on a Compact Disc (CD). CD is
an external storage device. It can hold upto 700 MB of data.
CD
Digital Versatile Disc (DVD)
Digital Versatile Disc (DVD) looks like a CD but it can store a large
amount of data.
Pen Drive DVD
A pen drive acts as a portable hard drive and is easy to use. It has a
storage capacity of upto 1TB.
Pen Drive
i + IPO CYCLE
A computer works on the IPO (Input-Process-Output) cycle. It receives input from the
user through input devices, processes it using the CPU and gives back the output using
output devices. This cycle is known as IPO cycle.
INPUT PROCESS OUTPUT
3, 6, + Data 3 + 6 Information 9
Instructions
Keyboard Monitor
CPU
11
A Computer System

