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Primary Memory

              This is the main memory of a computer. CPU can directly access this
              memory. It is fixed on the motherboard of a computer. Primary memory

              is further divided into two types:
              1.  Random Access Memory (RAM)                                                             ROM


              2.  Read-only Memory (ROM)
              Random Access Memory (RAM)

              RAM is a temporary  memory. The information stored in this

              memory  is lost when the computer is turned off. That’s why it
              is  also  called  volatile memory.  It  stores data  and  instructions                  RAM
              given by the user and also the results produced by the computer
              temporarily.

              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

              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.


              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 disk



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