Thanks for your positive input, guys, I really appreciate it
Anyway, I’ve tried backing up some of my PS2 DVD games with Verbatim DVD-R 8x, burned @4x. Strange though, some games (backup) work smoothly, while few others took more time to load, even during mid-game. On one copy of Super Robot Wars Alpha 3 using Verbatim, when I skip the intro, the game went to main menu (NEW GAME, LOAD, etc) but only for a few seconds, then it started the gameplay demo. The original copy won’t do that (it sticks with the main menu).
I tried another burn, this time with a CMS 12x, (ID TYG02, but I don’t know if this is a genuine TY), burned @ 4x, and the game works just fine.
Also, Super Robot Wars Z (again, burned @4x) took longer loading time (even during mid-game) with Verbatim backup, but the BenQ backup (@4x) works fine.
All those were burned using Pioneer A12FX with the latest firmware.