A computer hard disk drive (HDD) is a non-volatile memory device that controls reading and writing of the hard disk, which furnishes data storage. Hard disk drives are used as the main storage device in a computer.
HDD store operating system, software programs, video, picture, and other files, and can be found in desktop computers, consumer electronics and enterprise storage arrays in data centers
In a personal computer , HDD is found within the drive bay and is connected to the motherboard via a pata cable, SATA cable or SCSI cable. The HDD is additionally connected to an influence supply with power connector cable