Personally, I had problems with mini dvd-r media (that worked fine in older gamecubes). I tried tweaking the laser and I got DRE's all over the place. After buying a replacement case (I ran with no case for a while), I have found success with the Ritek/Ridata G05 DVD-R blanks and most DVD+R blanks. Now I don't get DRE's. Ever. I use GCOS 1.4. /bbking67