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✶  Memory Card: It is commonly known as multimedia memory

                                         card. It is very small in size. It is used in mobile phones and digital
                                         cameras. You need to have a card reader to read the stored data
                                         on memory card. It has a storage capacity up to 2 TB.

                   Memory card
                      MEASURING THE COMPUTER’S MEMORY

                  The basic unit for measuring the memory of a computer is byte. A byte consists

                  of a group of eight bits, for example, 10001011, i.e., 1 byte equals to 8 bits. A
                  group of 4 bits is known as a nibble (half byte), for example, 1001. Other units for
                  measuring the computer’s memory are kilobyte, megabyte, gigabyte, terabyte, etc.



                   ✶  1 Kilobyte (KB) equals 1024 bytes.                ✶  1 Megabyte (MB) equals 1024 KB.

                   ✶  1 Gigabyte (GB) equals 1024 MB.                   ✶  1 Terabyte (TB) equals 1024 GB.

                   ✶  1 Petabyte (PB) equals 1024 TB.                   ✶  1 Exabyte (EB) equals 1024 PB.

                   ✶  1 Zettabyte (ZB) equals 1024 EB.                  ✶  1 Yottabyte (YB) equals 1024 ZB.





                     Recap


                         RAM and ROM are the two types of primary memory.
                         The data and instructions that are entered into the computer using input devices
                         are stored inside the memory.
                         The basic unit for measuring the memory of a computer is byte.
                         Magnetic disc, Optical disc and flash drive are the three categories of Secondary
                         memory.






                                                         Exercise




                  A.  Tick ( ) the correct option.
                      1.  Which one of these is not a secondary storage device?

                          a.  RAM                           b.  DVD                         c.  Pen drive

                      2.  .................... equals 1024 PB.

                          a.  1 MB                          b.  1 EB                        c.  1 TB





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