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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 are 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 data and 25 GB 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  are 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 known as 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 SITE (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                    OneDrive

                  There are two types of DVDs:                                                                                              we store data in a cloud storage, we can save money that would otherwise have to be
                                                                                                               DVD
                      Digital Versatile Disc-Recordable                                                                                     invested in paying for storage devices.
                      (DVD-R): It allows only  one-time                                      Life Skills & Values
                      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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