I keep my iTunes music on an OWC external firewire hard drive to save space on my aging iMac. Stupidly, as I was replacing old data on the external hard drive with more recent data (iPhoto and Garageband--which I store on my computer's hard drive), I replaced my entire 36 gb iTunes music on the external hard drive with iTunes music from my mac that is empty! Is there a way I can recover my data from the external hard drive? What happens when you replace files? Where does it go? What tools can I use? Thanks so much. I'm so sick to my stomach I don't think I'll be able to enjoy my Thanksgiving meal!