Reasonable said:
I think it reserves cache space on HDD to aid in streaming in the background to HDD then to game in addition to streaming directly from BR. The engine in Uncharted had no real install, just some on the go use of HDD that was transparent from your point of view. So far as I know Uncharted 2 is the same. I'll have a peak next time I boot it up - which will hopefully be in a couple of hours!
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Yeah thats most likely the reason.