Please HELP, can not copy PS2 games!

[aarmel2]

Hi, I am new to PS2 copying. I can successfully copy those which can be done on a cd with clone cd, however, I can not get one on a dvd to work. I have tried using Nero 6 (Nero Express) making a data disc, but when put into my playstation it says to insert PS2 disc. I tried all my dvd burning programs e.g. clone dvd, shrink and nero recode but none of them can read the game files. I have a Pioneer DVD-RW, I think an A06. I have been trying on DVD-RW because I am wasting so many discs.
Also, is there a way to know that a game will need a crack before you copy it or do you have to waste a disc first? What is the best site and method to go about getting cracks?