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#1
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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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#2
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Are you using a bluetooth keyboard? If holding down Option doesn't go to the boot menu, Option isn't being recognized at boot time. Your backup isn't involved yet at all...
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--Dave Nanian |
#3
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No, I'm using an old crumb-catcher USB keyboard. And my option key is recognized in other applications.
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#4
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I fact (and now that I research "bless" a little bit, when I do
Code:
bless --info "/Volumes/Backup" Code:
No mount point for /Volumes/Backup Can't get mount point for /Volumes/Backup Though it is true that my backups were going fine. If there were a mount point problem, I guess I wouldn't be able to do backups. Last edited by Dan Lester; 02-20-2018 at 09:27 PM. |
#5
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The drive clearly isn't mounted with that mount point (if it's mounted at all)...
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--Dave Nanian |
#6
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Well, I am mystified. My daily scheduled backups are going without a hitch, and I can do an external boot handily by selecting the desired external drive in System Preferences->Startup Disk. I just can't seem to manually provoke an external boot by holding the OPTION key when I restart.
My OPTION key works. I can produce accented characters with it in Word, and I can switch speakers by holding down that key when I pull down the audio icon in the menubar. Now, this is not obviously a SuperDuper problem, unless SuperDuper is leaving the volume in such a state that it isn't seen when I hold the OPTION key when I boot. |
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