Hard driver installation is common these days with every major game opting for an irritating 20 minute or so installation time. Fortunately PlayStation3 owners who are picking up a copy of Portal 2 next week wont have any installation to face.
Portal 2’s Project Lead Joshua Weier has confirmed this:
We do not require users to install to the hard drive [note: there’s no hard drive install at all], but you’ll need 22 MB for saved games.
Portal 2 releases next week for the PS3, Xbox 360 and PC. Stay tuned with GB for more news and updates.