Any DVD I burn gets a verification error in nero, usually in 5 or 6 places. Same in CD Check, though usually different files fail there than in Nero. I have an LG GSA-4160b, running Windows 2003 on an Asus A7V333 mobo with 2 Maxtor hdd's (I defragmented and scandisk'ed after a few dead discs too). DMA is enabled, the drive is secondary master on an 80-pin cable and the bios shows it as DMA mode 4, and I'm using a bunch of Verbatim discs (half are CMC 2x, half are MCC 4x) and every disc I've verified has failed. The files are readable, mostly, but some video files did get a bad frame or two.
The thing is, I don't think it's Nero OR the burner, since I mounted an ISO twice in Alcohol 120% (same iso on 2 virtual drives) and it found an error. Comparing one file to itself shouldn't find any difference.
Virus scan and scandisk shows nothing, btw, and cd's work fine.