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TYPES OF COMPUTER MEMORY

            The computer memory can be classified into two types:

               Primary Memory                      Secondary Memory


                                               Computer Memory







                  Primary Memory                                             Secondary Memory





                                                    Hard Disk           CD           DVD           Pen Drive

                RAM             ROM

                                                          Blue-Ray Disc                 Memory Card



            PRIMARY MEMORY

            Primary memory is the main memory of the computer. It is also known as internal memory.
            It holds the data and instructions that the computer is currently working on and makes it
            easily accessible for the CPU to process.

            Primary memory is further divided into two types:


            Random Access Memory (RAM)
            RAM is a volatile memory.  The data or information stored in
            this memory is lost when the processing is incomplete or the
            computer is turned off. That's why it is also called temporary                      RAM
            memory. There are two types of RAM:

               Dynamic Random Access Memory (DRAM)

               Static Random Access Memory (SRAM)


            Read Only Memory (ROM)
            ROM is a non-volatile memory. The data and information stored in
            this memory do not lose even if the computer is switched off. It is
            permanent in nature. There are three types of ROM:

               Programmable Read Only Memory (PROM)                                                ROM

               Erasable Programmable Read Only Memory (EPROM)
               Electrically Erasable Programmable Read Only Memory (EEPROM)


                                                                                           Computer Memory    9
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