DVDr? ne1 know??

[LiqwidisT]

Hey fellaz...
I FINALLY got my usbmod to work (opened it up and resoldered it). I have a US 30001 v4 PS2, with the external usbmod. I can boot my cd-r backups, I know those work, but is it really possible to play DVDr backups??? I've read some things online about "holding" the power button and all that, but whenever I let go, the tray doesn't eject? I also read that you need a game with a bigger TOC than the b-up. I have GTA3 (and I read somewhere that it has one of the biggest TOCs for ps2?). Can someone please let me know if / how I can boot these bad boys up??? Thanx guys....
LiqwidisT