Why is my Hard disk capacity so low? Where are the missing gbs?

I have just purchased a mac book pro intel core duo 2ghz 80gb and have happily been instaling and setting up to suit all my needs.
It is currently showing that I only have 45.3gb of drive space left and that 28.91 gb has been used up already.
I know that i havent installed this much or even have that many files on it yet. my applications folder shows 4.72 gb in use and my documents folder shows 10.78gb. Theres 1 album so far on my itunes / music folder and nothig in ictures or movies. So where is the missing gbs? I can't believe the os system can be almost 14gb! Any clues?

Isn't the figure closer to 13? That is about typical.
To understand why, fire up Utilities > Activity Monitor (System Memory tab) and look at the size of Virtual Memory.
VM may be 5-8 Gig. That's all space being used on your hard drive by hidden VM files.
The sleep file may be 2-3 Gig. And then there are various caches that speed up all aspects of the computer.

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