I'm no math person but I have to say about 40 gbs.Vyse_Legends
Sherlock here answers your question, about 40 gig. But other stuff like 40 gig having only 2 USB ports and 80 gig having more, and also 40 gig CAN'T run PS2 games while 80 gig can. I think there's more, look it up on google. :D
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