How to Change iTunes Default Drive

I've been using my laptop's "D" drive to save my itunes. I'm now getting low disk space warnings as it nears 30Gb. I've got a 250 Gb USB drive I use to back up stuff on. Can I make this the default drive for iTunes & delete what's on the "D" drive ?

If so, how?



In Itunes go to Edit and preferences Ctrl + and in the Advance tab you can point iTunes to a directory/drive of your choice.
Thanks very much. I've done this now & deleted it off my "D" drive.