Newbie at Large

[KnightII]

I am trying to learn to copy PS2 games. I used CDRWin and made a bunch of copies waiting for my PS2 to be moded. After it was moded none of my backups work. My question are how do I back them up? What program is the best? What kind of CDR media is the best (i.e Sony, HP, Fujitsu, Generic)? What is the process. I would greatly appreciate any help I can get. This is my first post so I hope I have done everything right.
Thanks to all..