The hard disk is a permanent storage media, which is used to store huge volume of data. It is the most important and commonly used storage device. It is used to record computer data magnetically. A hard disk is physically composed of a series of flat and magnetically coated platters stacked on a spindle. A hard disk drive consists of a stack of inflexible magnetic disks mounted on a motor. As the disks spin at high speed, read/write heads at the end of a metal fork swing in and out to access the sectors of the disks.
