Hi, I've created a drive copy using Carbon Copy Cloner. Here's details: I've done everything the CCC help pages advise regarding drive preparation, including making sure I format using GUID partition table. I'm running Lion on my 2010 MacBook Air I can boot with my copy plugged into either USB port on 2010 MacBook Air When I try to boot the same drive on my 2011 MacBook Air it gives me a symbol - circle with a slash through it. It then shuts down. I'm baffled by this behavior. Anyone have any ideas?