Hey thanks 
Hehe yes it is crazy with those “old” formats… Having a DAT and even a Tape machine here… but from time to time someone with an “old demo” comes in…
Regarding the DVD - well, I was in a hurry so I just started to use another external DVD-R which worked nicely… Because a new LG DVD-R costs 12 EUR (!) only I just ordered one because I needed HDs anyway… I will check out if this will fix it, if not then it might be that external blue-illuminated case from Icy Box…
Funny thing is that I burnt a Master CD as well as 5 copys 10 minutes before - and all of them are fine (checked with Plextools Pro on an other system)… It seems that only the “Audio CD playback” is brocken… I can still use the drive for data stuff as well as for burning…