See Inside a Hard Drive
[metacafe 318610]
This Metacafe video by kipkay [kipkay.com] shows us the inner workings of a computer hard drive. Basically, kipkay took apart an old hard drive and ran his PC to show us the spinning hard drive disk and the quick moving arm. The clicking working sound that you hear when your computer does a lot of processing mostly originates from the hard drive arm flicking back and forth as seen in this video.
Inside A Hard Drive! See What Goes On Inside… [Metacafe]

Wow. Never seen a hard drive in action before…
I have a hard drive opened and kept it and it’s arm because they looked really really cool, and the magnet, which used to move the arm, is one of the most powerful magnet at my disposal
Oh, now I’m going to get my old hard drive or my friend’s old hard drive and take it apart to see the inside. Also was your hard drive muli-layered? Describe it.
1 Gb. Ancient, ancient thing, that hard drive was. It was two layered, and the disk was shiny. Note that I said “was”, meaning that it’s not shiny any more due to exposure and such…
Exposure to you. hahaha. What is it now, rusty? Bring me a disk!
hahaha Maybe it’ll then shine up! lmfao. Wait… this is not even funny…
Just ran across this parody video of all these “hacks.” pretty funny.
http://www.metacafe.com/watch/854406/hack_turn_your_laser_into_a_pen/
Hahaha. Laser blows up his room and house. Be careful, for the laser will kill you. LMFAO