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    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, i.e., 1 nibble equals to 4 bits. Other units for measuring
                    the computer’s memory are KiloByte, MegaByte, GigaByte, TeraByte and so on.

                        1024 bytes = 1 KiloByte (KB)

                        1024 KB      = 1 MegaByte (MB)

                        1024 MB      = 1 GigaByte (GB)

                        1024 GB      = 1 TeraByte (TB)
                                                                            The human brain can hold about 2.5
                        1024 TB      = 1 PetaByte (PB)                    PetaBytes of information, equivalent to a

                        1024 PB      = 1 ExaByte (EB)                      TV show being played for approximately
                                                                                     342 years non-stop.
                        1024 EB      = 1 ZettaByte (ZB)

                        1024 ZB      = 1 YottaByte (YB)

                              Experiential Learning                                                         Lab Activity

                        Visit your computer lab and find out what storage devices are available and also check how much
                        storage the devices have. Make a list in your notebook. Do this under your teacher's guidance.

                                Quick Quiz

                      1.  What is another name for Read Only Memory (ROM)?

                                 a.  Permanent memory                                b.  Temporary memory

                      2.   Which secondary storage device is small, portable and can be carried in a pocket, typically with
                          a storage capacity of up to 1TB?

                                 a.  Memory Card                                     b.  Pen Drive

                      3.   Which type of memory is considered temporary and loses data when the computer is turned off?

                                 a.  RAM                                             b.  ROM

                      4.  Which unit is larger: MegaByte (MB) or KiloByte (KB)?

                                 a.  MegaByte (MB)                                   b.  KiloByte (KB)

                                                                                           Data Storage and Memory     13

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