To round up this thread, yes it's 6.8 GB for game data. Nomatter how much this may hurt your personal feeling. Don't be too sad, as this isn't only affecting 360 development, PS3 and PC development indirectly through multi-platform games as well.
Both formats have their disadvantages and advantages, but certainly everyone with half a brain can understand the PS3's Blu-Ray advantages far outweigh the disadvantages compared to using a cheap, noisy, more scratch prone, highly performance variable, non-HD movie compatible and low capacity drive technically (especially in combination with a default harddrive). 







