Obviously, a complete failure of the internal storage can happen. But assuming that you don’t have a complete failure of the internal storage, you can boot from an external drive on an M1 Mac, as I understand it. So, in the same way that if the EFI firmware on an Intel Mac was hosed, if the internal storage on an M1 Mac is completely broken somehow, you can’t boot the Mac because it doesn’t have any firmware to bootstrap from, run a boot manager, etc. This is instead of the EFI firmware on Intel Macs. The short version is that part of the internal storage is sectioned off and essentially used as firmware, which contains the boot manager. The truth is more nuanced than that, and if you want to understand it fully, I recommend reading Howard Oakley’s excellent blog post detailing boot and recovery on M1 Macs. I think that’s a bit of an oversimplification. One could accomplish this by including a Shell Script in ADVANCED OPTIONS, but that is a separate discussion.
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