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    2                Memory and Storage Devices

                           Goal Glimpse

                               Measuring Units of Data                         Primary Memory

                               Secondary Memory                                Storage Devices

                      Computer  memory is like the  brain  of a  computer.  It stores information  and
                      instructions that  the computer  needs to work.  Memory helps the computer

                      remember things while it is on. Without memory, a computer cannot run programs
                      or do tasks. It is an important part of every computer system.

                            MEASURING UNITS OF DATA

                      A computer can only understand two digits: 0 and 1. These digits are called binary

                      digits or  bits. A bit is the smallest unit of data  in a computer  system. A byte

                      consists of 8 bits. For example, the binary number 10001011 represents 1 byte of
                      data. A byte is the standard unit used to measure memory and storage capacity in

                      most systems.

                      A nibble is a group of 4 bits, which is half of a byte. For example, the binary number

                      1001 represents 1 nibble.

                      Other larger units for measuring computer memory include:

                          1024 Bytes  =  1 KiloByte (KB)                         1024 KB  =  1 MegaByte (MB)

                          1024 MB       =  1 GigaByte (GB)                       1024 GB  =  1 TeraByte (TB)

                          1024 TB       =  1 PetaByte (PB)                       1024 PB  =  1 ExaByte (EB)

                          1024 EB       =  1 ZettaByte (ZB)                      1024 ZB =  1 YottaByte (YB)

                     14     Premium Edition-IV

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