I recently bought the slim Ps2 from Hong Kong and it has the Infinity Mod Chip installed. It is able to play the back up copy of chinese version GT4. I know for sure the GT4 was on DVD9. Therefore i can say my PS2 is capable of play backup DVD9 games. Now i need a guide how to burn GT4 on dl so i can try it on a mod chipped PS2 and not swap magic. I prefer a guide that uses DVD Decrypter because its easy and convenient to use.