The only help I can offer is that I'm having the same problem with a Sony DRU510a -- but with CD-R's (DVD's burn fine), so at least you'll know it's nothing new.
I'm coming to the conclusion it's most likely either system or firmware related.
In my case, the burner will handle smaller CD's and CD-RW's just fine -- I get the error with 90-minute discs (and with 99-minute, but Sony's setup instructions warn they might not work.)
It isn't the software, for I also get it in other programs, and I can switch directly to the other burning device (a Plextor SCSI 12/10/32S) without restarting whichever prog I'm running and it burns fine.
Submitted the problem to Sony USA support, only to be told to send it to Sony support in my own country (Australia) -- BIG JOKE:bigsmile:
Sony Australia's website doesn't even know the DRU510A exists, and "Sony support" in Australia is an oxymoron.
So it looks like I'm on my own once again.
Sooner or later I'll find it, I suppose...
When (and if...) I do I'll post it.