"How large is your hard-drive" vs "How big is your hard-drive?"

When referring to a hard-drive's capacity (In GigaBytes), is it correct to use any of the following:

How large is your hard-drive? How big is your hard-drive?

Or is there any better way for terming it?

I know it is safe to say "How many GigaBytes does your hard-drive have?" or "What is the capacity of your hard-drive?" but from the former two, is any correct?

How big, How large, and What size are all perfectly common ways of asking, but there's always the possibility you might get the answer 2.5", 3.5", etc., being the physical dimensions of the drive unit.

I'd use capacity in a written question where it might be tedious to have to ask again if you're misunderstood, but I think most people would use how big in general conversation.

To my ears, large has a slightly stronger connotation of physical size. Big is more informal but is also more often used figuratively to refer to some other sort of magnitude. For instance, a big game (importance), big earthquake (power), big payment (amount of money). In most cases large can be also be used, but seems to me to be a little more ambiguous. If you say someone has a big heart I understand that she is generous, while if you she has a large heart I wonder if she suffers from cardiomegaly.

So I would probably prefer big if the context is not too formal. In formal writing, I'd use the more technical capacity.