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The master private key itself is generated using entropy that device can provide itself with entropy provided by your PC.
Can you explain this to me. It has a hardware rng inside the trezor. Why does it sample additional (presumably inferior) entropy from the pc?
Because if the trezor entropy is good enough it shouldn't matter how bad the computer entropy is but it does demonstrate that
if something was wrong with trezor entropy at least it also mixed with the computer.