I've done a lot a searching but can't find a whole lot on this subject, most the threads are out of date since the game has been out for a long time now. I have GT4 (orig, not a backup) and I want to put it on HDloader because my PS2 laser is dying and GT4 froze last time I played it. So I start up HDloader and go to 'install', put in my GT4 disc and hit OK and it says "Not a valid PS2 disc!". Obviously it is, but HDloader can't detect it for one reason or anothere (because it's dual layer or something i imagine). I would really appreciate it if someone could tell me the easiest way to get GT4 working on HDloader without pointing me to other threads if possible, but I'll be thankful for help of any kind.