Fixed+Hard+Disk

=Fixed Hard Disk =

__What Is It?__
A Hard Disk (Hard Disk Drive) is your computer's main storage device. It is where you would normally keep your operating system, programs and files.



**__Where Is It Found? __**
 Fixed Hard Disk Systems Are Commonly Found In The Casing Unit Of Your PC. They Are Called Fixed Hard Disks Because The Disk Is Enclosed In A Sealed Case And Is Inaccessible To The User A Computer Can Have More Than One Hard Drive. These Additional Drives Can Either Be Internal Inside the Casing Unit Or External.

**__Whats Does It Look Like? __**
Hard disk drives contain platters (disk like objects) that rotate at speeds of 5400 rpm and above. (as fast as a jet engine.) There is a device called an actuator, which is like an arm, which moves across the platters and reads or writes the information.

The gap between the READ/WRITE heads and the platter is typically a lot less than the thickness of a human hair. The platters are made from an aluminum substance, these devices are a lot more reliable now than they used to be, although they can break down mechanically if you drop them!

__What Does It Look Like? __

Hard disks are flat, circular plates made of aluminum or glass and coated with a magnetic material. Hard disks for your own personal computer can store up to 7 gigabyte (one billion bytes) of information. Data is stored on the surfaces of the fixed hard disk.

__**Advantages And Disadvantages Of Hard Disk Drives: **__

 * Advantages of hard disks are: **
 * Speed
 * Durability
 * <span style="font-family: 'Comic Sans MS',cursive; font-size: 120%;">Reliability
 * <span style="font-family: 'Comic Sans MS',cursive; font-size: 120%;">Greater storage ability (e.g, 20-megabyte hard disk)

<span style="font-family: 'Comic Sans MS',cursive; font-size: 140%;">**<span style="font-family: 'Comic Sans MS',cursive;">Disadvantages of hard disks are: **
 * <span style="font-family: 'Comic Sans MS',cursive; font-size: 130%;">Can't remove them
 * <span style="font-family: 'Comic Sans MS',cursive; font-size: 130%;">Hard to get at
 * <span style="font-family: 'Comic Sans MS',cursive; font-size: 130%;">Costly