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Blu-Ray Disc

                                                                                                                                                     The Blu-Ray is an optical disc storage device. It is called Blu-Ray because it
                 Tick ( ) if you know this.
                                                                                                                                                     uses a blue/violet laser light to read and write data. It is used to record and
                 ▶   Data and information on a computer is stored in the form of 0s and 1s, called binary digits.
                                                                                                                                       Blu-Ray Disc  store high-definition videos and can store up to 25 GB of data which is over
                 ▶  1 Terabyte is equal to 1024 Gigabytes.                                                                                           five times more data than a DVD.




            SECONDARY MEMORY                                                                                                               PURE
            Secondary memory is the external memory of the computer that can store large amounts                                           FACT        A DVD and Blu-Ray Disc can store up to 4.7 GB of data and 25 GB of data,
                                                                                                                                                       respectively.
            of data permanently. It is not directly accessed by the CPU. It is cheaper in comparison to
            primary memory. Secondary memory devices are also called secondary storage devices.
                                                                                                                                      Pen/Flash Drive
            Hard Disk                                                                                                                 A pen drive is a small-sized storage device. It can be carried from one place

            Hard disk is the main secondary storage device, used to store data                                                        to another in a pocket. It is used to transfer data from one computer to another
            and information. It is fixed inside the CPU cabinet. It consists of one or                                                and can be connected to the Universal Serial Bus (USB) port of a computer.
            more  magnetic  disks  which is  used  to  store  and restore  digital                                                                                                                                              Pen Drive

            information for usage.                                                                Hard Disk                           Memory Card
                                                                                                                                                        It is also known as multimedia memory card. It is very small in size usually
                          Compact Disc (CD)                                                                                                             1-1.5 inches. These are used  in various  electronic  devices  like  mobile
                          CDs are circular in shape. It can store a large amount of data and can be                                                     phones, digital cameras, etc. You need to have a card reader to read the

                          carried from one place to another easily. It can store up to 700MB of data.                                  Memory Card      stored data on a memory card.
                CD        There are three types of CDs:
               Compact Disc-Read Only Memory (CD-ROM): It contains data that has been written                                                                  Which memory is called volatile memory?

              at the time of manufacturing and cannot be modified or erased.                                                                  uiz    Bee
               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.                                                                                                             ONLINE STORAGE (CLOUD STORAGE)

                                                                                                                                      We can also store data on various online platforms that allow online storage,
            Digital Versatile Disc (DVD)
                                                                                                                                      file sharing and syncing. It allows us to store data in an off-site location which
            A DVD looks like a CD and can store up to six times more data than a CD.                                                  can be accessed later on any computer anywhere through the Internet. If we                 Onedrive
            There are two types of DVDs:
                                                                                                         DVD                          store data in cloud storage, we can save money that would otherwise have to be invested
               Digital Versatile Disc-Recordable                                                                                      in paying for storage devices.
                                                                                   21 st
              (DVD-R): It allows only one-time                                  Century   #Responsibility
                                                                                  Skills
              recording.
                                                           “Do not hesitate to clear doubts from your
               Digital  Versatile Disc-Rewritable          teachers. Learn something new every day.”
              (DVD-RW): It allows to delete and                                           -Mr. Techie

              rewrite data on it.


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