Page 10 - Trackpad_V1_Book 4_Flipbook
P. 10

COMPUTER MEMORY


                  You know that the 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; millilitre 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 Brontobytes        1 Geopbyte



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





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