I'm mostly done with this conversation, but I'll note that space is not as cold as you're thinking: The coldest that voyager is gonna get in the next million years is 2.7K (thanks to the cosmic background radiation this is the equilibrium temperature of any object in deep space), not sub-1K, and it's a lot warmer than that now, latest report is about 200K (though that's about 8 years ago). It also doesn't have hard drives, though this is a pedantic point because it does use another form of magnetic storage. You're talking about a 'practical scenario' which is so far away from the theory being discussed it's completely and utterly irrelevant, like if you were talking about the temperature of the sun it'd make little difference in how much hotter you're talking relative to the relevant temperatures.