Page 12 - KEC Khaitan C4 Flipbook
P. 12

There are three types of CDs:

                     Compact Disc-Read Only Memory (CD-ROM): It contains data that has been written
                    at the time of manufacturing and cannot be modified or erased.
                     Compact Disc-Recordable (CD-R): It allows only one-time recording. Data written once
                    cannot be erased.

                     Compact Disc-Rewritable (CD-RW): It allows multi-reading. Data written on it can be
                    erased or rewritten.

                  Digital Versatile Disc (DVD)

                  A DVD looks like a CD and can store up to six times more data than a CD.
                  There are two types of DVDs:
                                                                                                               DVD
                                                                                         21 st
                     Digital Versatile Disc-Recordable                                Century   #Initiative
                                                                                        Skills
                    (DVD-R): It allows only one-time
                    recording.                                   “Do not hesitate to clear doubts from your
                                                                 teachers. Learn something new every day.”
                     Digital  Versatile Disc-Rewritable
                    (DVD-RW): It allows to delete and
                    rewrite data on it.


                                 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
                   Blu-ray Disc  five times more data than a DVD.



                      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
                                    Memory Card

                                    It is also known as multimedia memory card. It is very small in size usually
                                    1-1.5 inches. These are used  in various  electronic  devices  like  mobile

                   Memory Card      phones, digital cameras, etc. You need to have a card reader to read the
                                    stored data on a memory card.






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