i had my entire iTunes library, about 150GB of music files, stored on an external hard drive that was starting act wonky. so i bought a new hard drive and copied all the music folders onto that new hard drive. but now iTunes doesn't recognize all those files in the new location. how do i reconnect my iTunes library to this new hard drive? unfortunately, i've already deleted the old music files from the old hard drive so hopefully i don't need to do something with that. thanks!