Page 11 - KEC Khaitan C4 Flipbook
P. 11

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)





                      Tick ( ) if you know this.

                      ▶   Data and information on a computer is stored in the form of 0s and 1s, called binary digits.

                      ▶  1 Terabyte is equal to 1024 Gigabytes.



                 SECONDARY MEMORY

                 Secondary memory  is the external memory of the computer that can store large
                 amounts of data permanently. It is not directly accessed by the CPU. It is cheaper in
                 comparison to primary memory. Secondary memory devices are also called secondary

                 storage devices.

                 Hard Disk

                 Hard disk is the main secondary storage device, used to store data
                 and information. It is fixed inside the CPU cabinet. It consists of one or
                 more  magnetic  disks  which is  used  to  store  and restore  digital

                 information for usage.                                                               Hard Disk

                               Compact Disc (CD)

                               CDs are circular in shape. It can store a large amount of data and can be
                               carried from one place to another easily. It can store up to 700MB of data.
                     CD


                                                                                                Computer Memory    9
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