Hard disk

Hard disk is part of CPU (central Processing Unit), which have useful for to keep data in a computer.
this is the function of hard disk :

1. to storage operation system like Windows, linux.
every computer have operation system. Opertaing system will be save in Hard disk. before operating system saved, hrd disk will do format process. and next operating system like windows xp can be use.

2. to storage all kind of file like, picture, mp3.
all kind of file can storage in hard disk. At time hard disk capacity was be big. For home user, now they can to use hard disk which have size more than 300 Gb. 300 GB can
storage alot of file and document, 5,000 hours digital music, 96,000 digital picture, 300 hours music video, and 150 video game.

3. to storage all kind of program like microsoft office, game.
program in computer make them be many user in this time. before installing program, computer must have operating system, every program have the self unik and different proram, so different operating system.


The Kind of Hard Disk
1. Hard disk for dekstop
2. Hard disk for laptop
3. External hard disk
4. Hard disk for server (enterprise)


how to hard disk operating, data in hard disk saved in magnetic platter that rolling. With tranfer fluks electromagnet trought read/write head.