HARD DISK DRIVE

1. In a personal computer, a HARD DISK DRIVE (HDD) is the mechanism that controls the positioning, reading, and writing of the hard disk, which furnishes the largest amount of data storage for the PC.

FUNCTION
A hard disk drive (HDD) ^[b] is a data storage device used for storing and retrieving digital information using rapidly rotating disks(platters) coated with magnetic material. AnHDD retains its data even when powered off.

1. WHAT IS THE USE OF HARD DISK IN YOUR COMPUTER ?
2. The hard disk is the brain of the computer. It has the operating system installed in it to run the computer, and the data you provide goes into storage in the hard disk. With time, they become larger in capacity. 
   What ARE the uses of a hard disk in the computer? 
   To magnetically hold programs and data files on a smaller and easier to get to system. WIthout a hard disk - you would have to run your system using only yhe CD's that it came with - and the CD's that all programs came with!!!