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    External hard disks are also available. They are hard disks
                      that will be connected to any computer with the help of a
                      USB port.

                           The first commercially available hard disk drive was the IBM 350 Disk File, which
                           was introduced by IBM in 1956. It had a storage capacity of about 3.75 MB.

                      Solid State Drive (SSD)

                      A solid-state drive (SSD) is a type of computer
                      storage  that  stores  persistent  data  on  non-

                      volatile flash memory. SSDs work much faster than conventional hard disc drives
                      (HDDs) while performing the same vital tasks as hard drives. SSD comes in various
                      sizes with storage capacities as high as 8TB (Terabyte) or even more.

                      Optical Disc

                      An optical disc is an electronic data storage medium that can be written to and read

                      using  a  low-powered  laser  beam.  The  lifespan  of  an  optical  disc  is  longer  than  a
                      magnetic disk.

                      Compact Disc (CD)

                      The CD drive reads information stored on a compact disc (CD). CD is an external
                      storage device. It can hold up to 700 MB of data. Earlier, CD drive was connected

                      inside the CPU box but now it is not. Now, we can connect it using a USB port.

                      Digital Versatile or Video Disc (DVD)

                      Earlier, DVDs were widely used in computers. At that time, they
                      had became 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.

                      Blu-ray Disc

                      A  Blu-ray  Disc  is  used  for  storing  large  amounts  of  data  and
                      playing videos. The main difference between DVDs and Blu-ray
                      discs is storage capacity.

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