help with external

i have a western digital external hard drive and i want to keep my music on there and be able to access itunes on it......how do i do it? i already put the music on it, and when i tried to put the folder on my itunes it said c drive too small for it, but i dont want them to copy to my pc, just be on my itunes

Does this article help any?

http://www.tuaw.com/2006/09/19/how-t...al-hard-drive/