A few months ago, I bought a Western Digital 500GB Hard drive and made 2 partitions on it. One for my backup files and one for the clone of my hd made w/ Carbon Copy Cloner. How do I boot off of the clone. It is listed in the startup disk section in sys. prefs, but when I reboot and hold down the Option key, it doesn't show. It's light is on. Oh, by the way, I have a 17 inch Intel Core 2 Duo 2GHz iMac. The partition table says it is invalid when I try to edit the partitions. Any Suggestions???