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Update:
Drobo support is trying to figure this one out: so far they've had me update firmware on my Drobo Mini and verify/repair the SuperDuper partition. Since the firmware update, though, my 2012 MacBook Air no longer boots the clone off USB either. USB still works on my 2009 MacBook Pro and MacBook. Slightly ominous, but for my use this set-up is still acceptable.
Eric
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