I'm still running OS 10.4.11 after all these years, and I'm trying to finally start the gradual upgrading process. I have the Snow Leopard installation CD ready to go. But I know that I need to back up my hard drive before I install it. So. I bought a Seagate GoFlex external drive. This one: http://www.amazon.com/gp/product/B005IA8450/ref=oh_details_o00_s00_i00 I'm trying to format it for my Mac, and that's the problem. The Mac Installer that comes on the drive refuses to launch. I get as far as seeing the icon in the Seagate Setup Assistant window, but when I click the MacInstall icon, nothing happens. I tried using Disk Utility to format the drive, instead. I followed a guide that I found online and did these steps: 1. Went to the Partition tab. 2. Changed the Volume Scheme to 1 Partition. 3. Selected GUID Partition Table under the Options Tab. 4. Selected Mac OS Extended (Journaled) for the Format. 5. Clicked the Partition button. And it tells me that the Partition failed with the error "Could not unmount the disk." Now I'm at a loss. I don't know what to do, and any help would be greatly appreciated. I may as well ask, while I'm at it, what's the best way to back up my whole hard drive once (if) I do get this Seagate thing to work. I have Carbon Copy Cloner downloaded already, and I was planning to use that.