RavenCloud

Hi, I really killed a lot of cds with burnin for my dreamcast and this really sucks. Most of the games...or let me say "many" are workin but not all. What I want to know is: I downloaded a CDI for the game Rival School 2 by Echelon group.I burned it on a verbatim cd and with alcohol 100% version 1.9.7 and my dvd burnder is a plextor PX-716A. I burned the game with dao/sao,8x but when I tried to play it nothing happend. To see if the file is workin I mounted it on daemon tool and played it on chankast and it worked (little to fast but thats a chankast problem but it worked). So why in hells name is the game not workin on my DC? I really want that game so much and that's the only version I found on the internet and it was a selfboot i forgot to say. I really need help. Should I burn it with raw dao?does this really makes so much difference between dao sao and raw dao? Normaly I use Verbatim but also Platinum cds..I don't know if they are popular out of europe too but platinum are one of the best rated cds here. so what can I do? Please help!!! RC~ PS:I also have D2 by HYKAN but the nrg is 800 mb big..how can I burn it and is this a selfboot or not?