Copying PS2 games

[tdg8934]

Why do some DVD and CD games copy fine and play with a V4 modchip and others do not? With my DVD-R copies, I have to use an original DVD such as Final Fantasy X becuase it has a bigger TOC as you may know. I use the standard DVD copying program that came with my Pioneer A04 DVD recorder, and it copies fine. But only 50% of them actually work with my no solder V4 modchip using Gameshark 2 V2. Do I have to patch them? I though patching was only for PAL to NTSC switching and only for CDs?

Please help...Also If any one knows the secret to XBOX copying I would like assistance as NONE of them work on DVD-R, DVD-WR, CD-R nor CD-WR. I heard only DVD-WR or CD-WR work. I have evolution X ISO and can not get my Enigma X modchip to recognize anything. However, it does play DVD movies well (better than PS2) and original games well.

PLEASE HELP!!!