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    Hard Disk

                     The hard disk consists of one or more magnetic disks. Each disk in
                     the pack has top and bottom surfaces on which data is recorded
                     using magnetic head. It is permanently fixed in the system unit.
                     The most important function of the hard disk is to store program
                     files and data files.
                                                                                                       Hard disk
                                                 Hard disks are available in a variety of sizes with storage capacities
                                                 as high as 5 TB (TeraByte) or even more. The CPU can accesses data
                                                 stored on a hard disk much faster than it can access data on a CD.

                                                 External hard disks  are also  available.  They are the  hard disks
                                                 that can be connected to any computer with the help of a USB port.
                         External hard disk

                                                                Tech Fact

                               First hard disk was introduced by Seagate in 1979 which could hold 5 MB data.

                     Optical Disc

                     An optical disc is an electronic data storage medium that can be used to write and read using a
                     low-powered laser beam.

                     Compact Disc (CD)
                     Compact Disc (CD) is an external storage device. It can hold upto 700 MB

                     of data. The CD drive reads information stored on a compact disc. CD drive
                     is usually connected inside the CPU box but can also be connected using a
                     USB port.
                                                                                                               CD

                     Digital Versatile Disc or Digital Video Disc (DVD)

                     The DVD is almost similar to a CD, even the working is also similar. The only
                     difference is that it can hold more information than a CD. DVDs are widely
                     used for storing and viewing movies and other data.

                                                                                                              DVD

                     Blu-ray Disc

                     Blu-ray disc is an optical  disc.  It is used  for  storing a large amount  of
                     data. The main difference between DVDs and Blu-ray discs is that storage
                     capacity of blu-ray disc is higher than that of the DVD.

                                                                                                           Blu-ray Disc

                                                              Computer System Organization - Hardware, Software & Memory  49

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