Yes, you can boot from an external drive, but that's not what he's asking.
It's what he needs to do, but didn't state it.
With a loaner computer, there's no reason to bother to switch the hard
drive when you can plug in an external, possibly bare drive for a week
or so until the right computer arrives. Easy.
I can boot from a flash drive on my Mac. That's easier. Might work with
Windows?
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