New to this mod world and has a few questions

[PoKKi]

I just got my slide card (I've read a lot of messages saying how they suck and all...but it's the easiest way I know). I decided to try playing sosme backed up games. My friend lent me Cabela's Deer Hunt 2004 and it works fine. However when I tried it with Romance of Three Kingdom IX and Soul Calibur 2, they both won't work. I used Nero's "Copy" feature to make these disk. The PS2 recognizes the discs, but they freeze up. I was wondering if I should be using another program to "BACK UP" these games. Also, I my friend also told me that the PS2 doesn't like reading disc burned on 4X speed. Is that true? Would that effect the games I "BACKED UP"?

I have a Pioneer A07 on external case and my computer is a Dell Inspiron 8500 with a DVD/CD-RW drive.

Please help me out! I don't have that much money to spend on DVD-Rs.