How to check Hard Drive space?

Hey...
I am new here...bought a MacBook last July and I am loving it. Just one question though...I bought a MacBook with 120 GB RAM but when I check the computer it says that it's capacity is 74.21 GB which I am thinking is actually the 80 GB RAM. Also, when investigating further, I realized that the serial number on the box was in fact different than the serial number listed on the computer directory. Is this common or did I get ripped off?
Thanks
Jay.D
Message was edited by: JayDNewell
Message was edited by: JayDNewell

i have a fealing you waited to long to go about trying to fix this, if you paid for the 80 and wanted the 120 then the guy that sold it to you is either dumb or just made a mistake. if you paid for the 120 and got and 80 you probably got ripped off, but this late in the game you can't really go back.
hope that it works out for you

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