most are around 1gb, some slightly larger and some slightly smaller. 20gb HDD should suffice for demos alone (especially since you will probably delete most after playing them) aswell as save games and DLC.
It depends on what type of demo it is. If the demo has a playable multiplayer section it takes up more space. Also it depends on the length of a demo. The most recent demos that I've downloaded were Left 4 Dead 2 which was about 1.5 GB and Batman:AA which was about 1.3 GB. I'd say for the demos that I've downloaded in the past the average size is around 1 GB each.
no 20 gig HDD is not enough....for me ill say that. u can get one but ull wind up seriously micromanaging your HDD space maybe a year down the line after some add on content, arcade game downloads, and demos. that space will add up quick.......
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