Internal hard drive failed - install Mac OS X on external firewire?

Hi, hope someone can help me.
The other day my internal hard drive in my MacBook started to click. I did a hardware test, and the drive now doesn't show up at all, either in the test or when I go to install Mac OS X.
Is it possible to buy an external Firewire hard drive, and install Mac OS X on it, even though the internal hard drive isn't recognised?
Here is the external hard drive I was going to buy http://www.amazon.co.uk/Western-Digital-Premium-External-Firewire/dp/B000F6SGB4/ ref=sr11/203-7120413-7742330?ie=UTF8&s=electronics&qid=1174334464&sr=1-1
Also, is there any thing else I need to know before I do this...
I need to boot from an external hard drive as I cannot go to an Apple store to get it fixed and I am not really in a position to send it off for repair, as I am at Uni.
Thanks for your help!

You need to call AppleCare Support and get the hard drive replaced. None of the MacBooks are a year old yet, so they're all still covered by the original one year warranty. This sounds like a problem that should be covered, why bother with an external drive? If you're not willing to be without it, yes, you can install Mac OS X to a FireWire or USB 2.0 hard drive and run your MacBook from that.
-Doug
P.S. If I were you, I'd spend the extra £15 and get the 320GB version of that drive. I'd get as big of a drive as you can!

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