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Fun            First hard disk was introduced by Seagate in 1980 which could
                         Fact!
                                          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.                     COMputer MeMOry
                 Compact Disc (CD)

                 The CD drive reads information stored on a compact disc (CD). CD is

                 an external storage device. It can hold upto 700 MB of data. 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                                         9
                                                                                                                           9
                 CD-rW.                                                                                     CD

                 Digital Versatile Disc or Digital 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. 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

                 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.

                                     Blu-ray Disc

                                     Blu-ray disc is an optical disc. It is used for storing a large amount
                                     of data and playing videos. the main difference between DVDs and

                                     Blu-ray discs is that storage  capacity of blue-ray disc is higher
                                     than that of the DVD.
                   Blu-ray Disc

                 Flash Drive

                 The  Flash  Drive  is  a  small  portable  data  storage  device  integrated  with  a  uSB
                 (universal Serial Bus) connector. Flash Drive, 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.
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