Booting an M1 Mac from an external disk: it is possible
Last week I described how I had been unable to get either of my M1 Macs to start up from an external disk. Thanks to many comments but no real clues, I’ve now been able to solve this, and here explain how you can do this too. Reliably.
from Pocket https://eclecticlight.co/2020/12/22/booting-an-m1-mac-from-an-external-disk-it-is-possible/
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