The New Xbox Experience lets you install 360 games onto your HDD. Great news for anyone - like myself - who gets DISC READ ERRORS as often as the sun both rises and sets. But chances are, unless you splurged and bought yourself an Elite, or are new to the 360 world and own a 60GB unit, you have a 20GB HDD. And for you, space is at a premium. So you need to know how much room the installs actually take up, so you can get prioritising.