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COMPUTER MEMORY

            You  know that  computer  takes  input  as data  and  instructions  and gives  output  as
            information.  The entered input (data and instructions) and received output (information)
            are stored inside a memory which is called computer memory. The data stored in the

            computer can be stored for a long time and can be retrieved  from the computer’s memory,
            as and when required.


            HOW IS MEMORY MEASURED IN A COMPUTER?
            We use different units of measurement to measure something, such as gram and kilogram

            for measuring weight; metre and kilometre for distance; mililitre and kilolitre for liquid.
            Similarly, the measurement unit or storage unit in which the computer stores information
            is called memory unit. The basic unit for measuring the memory of a computer is the byte.

               Byte: A combination of eight bits makes up a byte. For example, 10001011, i.e., 1 byte
              equals 8 bits.

               Bit: Data and information on a computer is stored in the form of 0s and 1s . These are
              called binary digits or bits. A group of 4 bits is known as a nibble (half byte).

            The following are the various units of computer memory measurements:


                            8 bits      1 byte                         1024 bytes       1 Kilobyte (KB)




                 1024 Megabytes         1 Gigabyte (GB)             1024 Kilobytes       1 Megabyte (MB)




                  1024 Gigabytes        1 Terabyte (TB)             1024 Terabytes        1 Petabyte (PB)




                  1024 Exabytes        1 Zettabyte (ZB)              1024 Petabytes        1 Exabyte (EB)




                 1024 Zettabytes        1 Yottabyte (YB)             1024 Yottabytes        1 Brontobyte





                                             1024 Brontobyte         1 Geopbyte


                                                                                                PURE

                              A group of 4 bits is called a nibble, i.e., 1 byte = 8 bits       FACT




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