"I don't think the chart needs to be explained, you have the games, you have how much space they would take on your hard drive, and then how much time you'd be saving (not listed on the chart is how much relief you will be giving your poor disc drive). No longer do 360 fanboys have the fodder of "oh you PS3 people have to install games blah blah" .. in the end, if you have a big enough hard drive, you know you'll be installing these games soon enough."