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    SECONDARY MEMORY

                      Secondary memory  is the external memory of the computer that can store large
                      amounts of data permanently. It is not directly accessed by the CPU. It is cheaper in
                      comparison to primary memory. Secondary memory devices are also called secondary
                      storage devices.

                      Hard Disk
                      Hard disk is the main secondary storage device, used to store data

                      and information. It is fixed inside the CPU cabinet. It consists of one or
                      more  magnetic  disks  which is  used  to  store  and restore  digital
                      information for usage.                                                                Hard Disk

                                    Compact Disc (CD)

                                    CDs are circular in shape. It can store a large amount of data and can be
                                    carried from one place to another easily. It can store up to 700MB of data.

                          CD

                      Digital Versatile Disc (DVD)

                      A DVD looks like a CD and can store up to six times more data than a CD.

                                                                                                                   DVD
                                       Blu-ray Disc
                                      The Blu-ray is an optical disc storage device. It is called Blu-ray because it
                                      uses a blue/violet laser light to read and write data. It is used to record and
                                      store high-definition videos and can store up to 25 GB of data which is over

                                      five times  more
                       Blu-ray Disc   data than a DVD.                                    21 st   #Initiative
                                                                                        Century
                                                                                         Skills

                                                                  “Do not hesitate to clear doubts from your
                                                                  teachers. Learn something new every day.”

                          PURE         A DVD and Blu-ray Disc can store up to 4.7 GB of data and 25 GB of data,
                           FACT        respectively.

                      Pen/Flash Drive
                      A pen drive is a small-sized storage device. It can be carried from one place to

                      another in a pocket. It is used to transfer data from one computer to another
                      and can be connected to the Universal Serial Bus (USB) port of a computer.
                                                                                                               Pen Drive

                       10   Premium Edition-IV

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