is it possible to..

[nickjalder]

upgrade the hard drive space on my macbook currently 120gb

cheers

 

[Igantius]

Yes - manual on Apple's support site.

 

[Blue Velvet]

http://www.ifixit.com/Guide/Mac/MacBook/86/0

 

[heySparky]

Not only is it possible, it is pretty easy to do. Follow the above referenced guide. I did the upgrade. It took way longer to back up the original HD that it took to swap them.