How To Tell Which Game Needs To Install On The HDD?

Quick simple question. when you look at the game box is their anyway to tell which games need to install themselves on the hdd to play?

Oblivion for example puts 5 GB on the hdd, also bought GT5 Prologue yesterday boxed version and it installs 5.5GB on the hdd, after the auto update its 6GB. Makes you wonder whats the point of this game doing that.

If loads of games install to the hdd you wouldnt be able to play that many games!

The point is, those people who have a 40gb ps3 or even a 20gb ps3 wont be able to own many games, unless they upgrade the HDD themselves. i wish games gave you an option to install or not!

On my 40gb i have Oblivion & GT5 Prologue installed (Prologue still needs the cd to play even tho it installed 5 odd gb) and i have 19gb left.