I also have the TEAC-512EB and indeeed its really hard to burn a cdi-image!
I don't know how many non working CD i have...(stopped counting them)
one major problem for me was that the game went directly to the DC menu (where the 4 icons are displayed... start game,vmu,settings,audio)
it didn't went directly into the Audio menu, so there wasnt the problem with wrong version, or short track error............................................. ....
one day I thought: man instead of fu**in so many CDs why dont U freek your DC-Laser and burn on CD-RWs?
and so I did...
and supprise! the games worked! ( with 10x(speed)CD-CDRW)
than I ran to my trash-bin and took my old "non-workin" games... they all worked!
(lol... now I have 6 times Grandia2 ...)
maybe U should try burning at lower speeds... or sthn.?
I'm new to this (2-3 weeks) so i cant explain whats going on...
but this Laser tweak did work for me... (the bad thing is: the games don't work on unfreeked DC-consoles
(((((
maybe someone with more knowledge could help us?
maybe I should go and ##### it for the PLEXTOR!?
my other Traxdata 2x CDRecorder just has no problem so for my friends i connect my oldTraxdata and wait 1 hour to finish the game! but it works...
I tried burn with 4x(speed) with my teac but still didnt work on nonfreeked DCs.....
BUT IT CANT BE THAT THE TEAC DRIVE IS CRAP!?!?!?