need help copying PSX games with CloneCD

[hc_freak]

Ok, I had 3 games to copy which are Vagrant Story, Metal Gear : Solid, and Xenogears.

I had no problems doing a copy of the first one (Vagrant Story), but when it comes to the two others, I always end out with non-working copies.
Here's what I put in CloneCd : Read - 1x, Write - 1x. That should be ok, no?

And what is so strange about that is that I succeeded in burning one of them. Can anyone please help me?