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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



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                                                                                            A Computer System
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