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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 disk, 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 also 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 Disc 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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