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ROM (Read Only Memory)

                                    It is permanent in nature. It is non-volatile which means its contents remain even after
                                    the computer is turned off. The information is coded at the time of manufacturing the
                                    computer. The computer needs this information for its basic functions.

                Read Only Memory

              Secondary Memory

              Secondary Memory provides extra storage where the data can be stored permanently for later use. It is also known
              as external memory as it can be stored anywhere. Examples of secondary memory are compact disc, hard disc,
              flash drive, etc.


              Hard Disk

              A Hard Disk  stores and provides quick access to large amounts of data  on an
              electromagnetically charged surface or set of surfaces. Hard disks are generally fitted
              inside the system unit. However, there are external hard disks also available. A hard disk is
              made-up of a collection of disks called platters stacked on a cylindrical rod. Each of which,
              like phonograph records, has data recorded electromagnetically in concentric circles or
              “tracks” on the disk. The capacity of a hard disk varies from a few Gigabytes to a few    Hard Disk
              hundred Terabytes.



                                    CD
                                    A compact disc is a small, portable, round disc made of molded polymer used for recording,
                                    storing, and playing back audio, video, text, and other information in the digital form. It
                                    was originally developed to store sound recordings exclusively, but later it also allowed the
                                    preservation of other types of data. It stores data of low capacity upto 700 MB.
                     CD


              DVD

              Digital Versatile Disk is used for storing digital data using optical rays. It is the same size as a
              CD, but has a larger storage capacity. They are commonly used to store large volumes of data
              including audio and video files. It stores data upto 10 GB.
                                                                                                              DVD


                               Blu-ray Disc
                               Blu-ray disc is of the same dimension as that of CD or DVD and uses the same optical rays
                               technology for recording and playing back high-definition (HD) video and for storing large
                               amounts of data. It has a capacity of up to 25 GB.
                 Blu-ray Disc


              Flash Memory
              Flash drive functions as a portable hard drive. It’s a small and portable memory card that plugs
              into a computer’s USB port. USB flash drives are smaller and more durable with large storage
              capacity. It can be used in any computer with USB port. USB flash drives are also called thumb
              drives, pen drives, key drives, or simply USB drives. It stores data upto 2 TB.             Flash Drive

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