QUOTE(nicki_flute @ Jun 15 2008, 02:04 PM)

Well, it's just turned on, and I've copied any vital documents to a memory stick. I do have a copy of some stuff at home, but not everything.
Would I have to get a new laptop if this hard drive fails?
No. Hard drives in notebooks are replaceable - they are a standard size. Get the Largest capacity you can afford.
It is not difficult to do it yourself, as long as you obey the warnings about earthing yourself to the cage of the computer before touching any components.
The only thing that is more difficult about a laptop than a desktop machine is opening it up in the first place. As well as the obvious screws that you can see there are usually a few hidden ones. There will be some in the battery compartment, and maybe in any compartment for plug in cards and extra memory. Sometimes they are under the keys on the keyboard, so have to prise the keys off and click them back on afterwards. Sometimes you have to remove the entire keyboard before you can open the case. The only tools you are likely to need are a couple of watchmaker's screwdrivers of appropriate size and a pair of tweezers.
There are two golden rules:
1. Don't force anything - if the case does not open easily you haven't found all the screws yet
2. Keep detailed records of what order you removed things, and exactly which screw goes there. You may think you will remember. Trust me - you won't!
You may be able to find detailed instructions if you search the web - but you'll need to know the exact model of your laptop.
Cheers
Tom