Can i access my library from two hard drives at the same time?

hello!
i have way too much music on my hard drive and would like to move some to my external drive and leave some on my local drive. that way when i'm writing papers at the cafe, i can access some music and when i'm at home, i can get it all. is this possible? if not, how should i deal with a 20 gig music file?
thanks!

The best way to do this is to attach your eHD, then in your iTunes Preferences "Change Location" of your iTunes Music folder to the eHD; from then on all music you add will go to the eHD but what's on your HD will stay there, and iTunes will keep track of what is where.
Two things : when away from home, your eHD tracks will all have ! next to them as iTunes will not "see" them; also when you are at home, make sure the eHD is attached before you launch iTunes.
A second strategy is to move your entire iTunes Library to the eHD (read this article first : http://www.ilounge.com/index.php/articles/comments/moving-your-itunes-library-to -a-new-hard-drive). Then, on your Mac, launch iTunes with the Option key pressed down, then Create Library.. and set up a new Library with a subset of your favourite tracks you keep on your Mac. In future use the "launch iTunes with the Option key pressed down" trick, then Choose Library.., to switch between them.

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