So, I am just messing with my Pro and thought it would be a fun to play with a theory.
I don't know how the Secure Boot would handle that or any other internal system config checker or whatever.
I have read that you can install other OS onto the Surface Pro, because SecureBoot can be disabled on the Surface Pro. With that I believe it should be possible to upgrade the hard drive to a higher capacity without a problem.
Nokia Lumia 920
HP TouchPad dual boot WebOS and JB 4.4
Microsoft Surface Pro 128Gb
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