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Tech Fact

                            First hard disk was introduced by Seagate in 1980 which could hold 5 MB data.




                  Optical Disc
                  An optical disc is an electronic data storage medium that can be used to write and read
                  using a low-powered laser beam. There are three types of optical discs: CD, DVD and Blu-ray.

                  An optical disc generally has a longer lifespan than a magnetic disk. The optical discs are not
                  used commonly now a days.

                                      Compact Disc (CD)
                                      Compact Disc (CD) is an external storage device. It can hold upto 700 MB
                                      of data. The CD drive reads information stored on a compact disc. CD drive
                                      is usually connected inside the CPU box but can also be connected using a

                                      USB port. There are three types of CDs: CD-ROM, CD-R, and CD-RW.
                        CD
                  Digital Versatile Disc or Digital Video Disc (DVD)

                  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. DVDs come in
                  single-layer and dual-layer formats.  A single-layer DVD  can hold up to
                  4.7 GB of data, while a dual-layer DVD can store up to 8.5 GB.                            DVD


                                    Blu-ray Disc

                                      Blu-ray disc is an optical disc. It is used for storing a large amount of data.
                                    The main difference between DVDs and Blu-ray discs is that storage capacity
                                    of Blu-ray disc is higher than that of the DVD.

                     Blu-ray Disc

                  Flash Drive

                  Flash memory, also known as flash storage, is a type of non-volatile memory. It is used for
                  easy  and fast  information  storage  in computers,  digital  cameras  and home  video  game
                  consoles. Some of the devices based of flash memory are pen drive, memory card, and solid
                  state drive.

                  Pen Drive

                  Pen Drive 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



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