I have a 320Gb and 750Gb external hard drive and my iTunes library is on the 320Gb. It's getting very full. I've copied everything from the 320Gb to the 750Gb. I just want to put away the 320Gb drive for safe keeping and use the 750Gb drive as my every day unit. iTunes on my iMac comes up with exclamation marks for the new library. Is it just a matter of pointing iTunes to the new library? Have I created an monster? We're talkin' about 300 gigs of tunes here.