Does anyone know how to move your entire iTunes library to an external drive, and still have it work when you click the iTunes shortcut (on Mac)? I can physically move the library to a folder on a drive, but when I open iTunes, it acts like it's a new program...no content at all. I have opened "preferences" and selected the new "iTunes media folder location", but nothing changes. I need to free up some space on the HD ASAP, so, can anyone help????