I dont really see a point to the hdd addon, as you can just buy a laptop hdd, and put it in there.
in japan a guy set up 400gb external HDD for desktop
i found it on youtube
im new member here i cant post links
go youtube search 400gb hdd PS3
& yeah can pick up SATA 2.5 80gb + HDD cheap and install them sony also says the warranty is still fine
i smell a huge flop