I'm still converting things from my desktop to my MacBook. I have an external with my music files on it. I'm trying to put some music into my itunes, but when I do it says that I don't have permission to change the New Volume. It shows that my music folder on the external is locked. Now, is there any way that I can unlock the music folder? Or is there another way I can set everything up to play form my external but not save anything new to it?