It's not like I'm ripping ten DVDs a day, I think in a matter of a year I ripped about 25 Movies and 20 CDs with those drives.
The used drivers are the normal windows xp stan. drivers, but there's also an adaptec aspi installed.
The fact that brought me the idea, that maybe the ripping could cause the failures is the following: the special running modes that any drive has, lunsed for playing audio-cds, video-cds and dvds seem to be the most damaged parts of all. You can still copy data, but slower. And you can still rip movies properly. It just looks like the special reading-modes are damaged, which I thought are used for ripping in general.