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    Plotter: A plotter is a type of printer that draws high-quality
                                              images  on  a  very large sheet  of paper.  They  are  used  by
                                              engineers, architects, scientists and designers.

                             Plotter

                     STORAGE DEVICES

                       The devices that are used to store data or information are called storage devices.
                     We can store songs, pictures, games, videos and many other forms of data on them.

                     The most commonly used storage devices are:

                     Hard disk: A hard disk is the main storage device fixed inside
                     the CPU box. It stores the  largest amount of data as compared

                     to other storage devices.

                                                                                                        Hard disk
                                     Compact Disc or CD: A compact disc or CD is a flat, circular piece of
                                     plastic with a shiny surface on one side. It stores less amount of data.

                           CD

                     Digital Versatile Disc or DVD: A digital versatile disc looks like a CD
                     but can store six times more data than a CD.
                                                                                                                 DVD
                                           Pen drive: A pen drive is a very small and a light portable device

                                           that can store and transfer data from one computer to another.
                                           A pen drive can store more data than a CD or DVD. It is also
                        Pen drive
                                           called a flash drive.

                             The first hard disk was introduced by IBM. It could store one MP3 song      PURE
                             only.                                                                       FACT

                               COMPUTER SOFTWARE

                     A computer hardware has numerous features, but it cannot perform a task until

                     certain  instructions  are given to  it.  Hardware needs  step-by-step instructions
                     to  perform a  task.  A  set  of  instructions  given  to  the  computer  to  perform
                     specific tasks is called a Program. A collection of programs is called a Software.

                                                                                                 Operating a Computer  29

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