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by wtallis 605 days ago
As far as I know, they can't. Why would Thunderbolt be special?

At least some portion of an operating system's bootloader chain must be installed to the internal storage, because that's all the firmware knows how to read (unlike Wintel PCs where there's a UEFI driver providing USB storage stack support). That bootloader running from internal storage is then free to enumerate external storage devices to locate the rest of the OS it is trying to load.