You need to mod the DC to play burned ISO's without a boot disk. And games from Japan. And etc. You can convert most of the .ISOs to self-booting .cdi relatively easily. I spent quite a bit of time doing this with older releases. I guess the fact that my only two legit discs were Skies of Arcadia (omfg, awesome?) and Soul Calibur.. You can do whatever you want as you already have a modded DC.