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Message: <blockquote data-quote="plumpjack" data-source="post: 1617863" data-attributes="member: 298978">Having trouble booting from a Carbon Copy Clone drive. Spec:Mac Pro early 2009 Running 10.6.82.5” USB 3.0 Samsung 500GB M3 driveCCC 3.5.7 [trialware]This is a dedicated drive. Nothing else is on the disk beyond the cloned image. The disks are correctly formatted with GUID and OS X Extended [Journaled]. This is a bootable USB drive. It does not need its own power source.Startup Disk recognizes the USB drive in System Preferences and the clone boots if I alter preferences manually. So the clone is functional.It does NOT show up on Startup Manager using the Option key however. It shows only the system disk. No joy from the ‘C’ key either.I contacted Carbon Copy Cloner and they told me to use a USB 2.0 cable on this USB 3.0 device as they'd found this worked much of the time.USB 2.0 cables are physically different. They just don't fit [that I can see] surely?Suggestions appreciated.Thanks for any help</blockquote>