O.K. I bought two ps3s my first was a 40 Gig and my second is a 40 Gig
I wanted to know is it possible to take my 80 gigs hard drive and put it in my 40 Gigs (hence switching PS3 hard drives) with my 40 Gig now working like a 80 if so where do i unscrew to access my ps3's hard drives

http://www.gamepro.com/article/features/127009/how-to-swap-out-and-upgrade-a-ps3-hard-drive/

that makes no sense its says u bought 2 40Gbs and then says 80Gb. I get what your saying but switching the HDD won't make your 40Gb work like an 80Gb with the features it will just increase the HDD capacity hence the HDD it self being switched. All u have to do is look on the left side of the Ps3 and there will be a removable cover and the HDD is in there remove the blue screw and switch the drive its not complicated to see how its done