Help with copying PS2 DVD

[MegaPyro6]

I've heard that it can be done. After it goes to the gameshark main menu press the eject button and put in an original DVD game with a higher or equal TOC than the backup. Then theres this one game(gauntlet legends i think) that if you turn on all the codes and try to start with codes it says theres too many codes and takes you back to the main menu. After this happens swap the backup in (knife trick) and start without codes. Thats what i remember seeing, but i've personally never seen it work, nor have I ever seen it tried. If you want to do that you can, but a modchip is much easier and safer.