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disc is more than a magnetic disk. It can hold upto 700 MB of data. CD drive is
                  usually connected inside the CPU box but can also be connected using USB port.

                  Types of CDs

                  1.  CD-ROM (Compact Disc Read Only Memory): A CD-ROM is a CD containing
                       data which has been written at the time of manufacturing. The data cannot be
                       modified or erased.
                  2.  CD-R (Compact Disc Recordable): A CD-R can be used to

                       write data by the user only once. This data cannot be changed
                       or erased.
                  3.  CD-RW (Compact Disc Rewritable): A CD-RW can be used
                       to write data again and again. The data can be erased and
                       modified as many times as required.                                                 CD


                  Digital Versatile or Video Disc (DVD)
                  DVDs are now widely used in computers. They have now become
                  a popular medium for storing information and video. The DVD is
                  almost similar to a CD. Even the working is also similar. The only
                  difference is that it can hold more information than a CD. DVDs
                  are widely used for storing and viewing movies and other data.
                                                                                                           DVD

                  Blu-ray Disc
                  Blu-ray disc is an optical disc. It is used for storing large amount
                  of data, and playing videos. The main difference between DVDs
                  and Blu-ray discs is storage capacity.
                                                                                                        Blu-ray Disc
                  Flash Drive
                  The Flash  Drive is  a small  portable  data storage  device integrated  with a USB
                  (Universal Serial Bus) connector.


                  Pen Drive
                  It acts as a portable hard drive and is easy to use as it is small and
                  can be carried in a pocket and plugged into any computer with a
                  USB drive. Pen drive has storage capacity of upto 1TB.                                  Pen drive


                  Memory Card
                  It is commonly known as multimedia memory card. It is very small

                  in size usually 1–1.5 inches. These are used in mobile phones and
                  digital cameras. You need to have card reader to read stored data
                  on memory card.                                                                      Memory card






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