HARD DISK (HDD)

Hard Disk drive (HDD) is a personal computer storage device that uses fixed media, which means that the disk is built into the drive and the drive remains in the computer unless you are performing an upgrade or a repair. Hard disk connected directly to the system board via one cable for data and one cable for power. The hard disk itself consist of several metal or hard plastic platters with a magnetic surface coating. Data stored magnetically and can be accessed directly. the data from HDD is connected to system board by PATA cable or SATA cable.

There are two types of hard drives. they are,
1.Internal  Hard disk
2.External hard disk

                                                           INTERNAL HAR DISK

                                                        EXTERNAL HARD DISK