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Read Only Memory (ROM)

              ROM is the permanent memory, i.e., it holds the data even if the system
              is switched off. It holds the starting instructions that are required to
              start a computer. It is also called non-volatile memory.

              Secondary Memory                                                                           ROM                                       DVD


              This memory is permanent in nature and is not directly accessed by the CPU. It allows users to
              store data that may be easily retrieved.

              Secondary memory devices are also called secondary storage devices. Lets learn about some
              secondary storage devices.


              Hard Disk

              Hard disk is permanently fixed in the CPU Box. The most important
              function of the hard disk is to store program files and data files.
                                                                                                     Hard disk

                                         Factbot


                                 World's first hard disk was introduced by IBM in 1956.


              Hard disks are available in a variety of sizes with storage

              capacities as high as 5 TB (Terabyte) or even more. The CPU can
              access data stored on a hard disk much faster than it can access
              data on a CD.

              External hard disks are also available. They are the hard disks that              External hard disk
              can be connected to any computer with the help of a USB port.

              Compact Disc (CD)

              Compact disc (CD) is an external storage device. It can hold upto 700 MB
              of data. To be able to write data on or read data from a CD, you need a

              component called a CD drive. The CD drive reads information stored on a
              compact disc. CD drive is usually connected inside the CPU box but can                         CD
              also be connected using a USB port.














                                                              CD Drive


                  12  Plus (Ver. 4.0)-IV
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