I need some help with ff9 copying..........

[Hensch]

i have sucessfully copied Disc 1 and 2... they seem to work.. i have played at least 3 hours in the game.. but disc 3 and 4 however won't even get to the title screen and freezes up.. it gets past the 1st sony screen then it screws up... do i need a patch for those discs?
i am new at this kind of stuff... can anyone help me?