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can't external boot
So, all of a sudden (I think I last did it successfully last year), I can't boot to a SuperDuper clone. I restart and hit the OPTION key. Goes straight to the login pane. Uh, what??? My boot disks are mounted, and I can see them in System Prefs>Startup Disk. I reset SMC and PRAM and I still can't boot external. My OPTION key works. Now I've heard that there is some mysterious business about "blessing" an external disk to make it bootable. I've never done it. But maybe I suddenly need to do it for some reason? Is that what's going on here?
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