In the new batch of discs I purchased I am experiencing far too many failures (around 1 in 6). They are DiscRite 80minute - I had burnt 100 of these in my Plextor 24/10/40a with only 2 failures due to x12 write, PIO mode as my Win98 removed the UDMA option for the writer, and I was using the machine for other things - oh, burnproof was off at the time.
The disc that made me write this query passes the scandisk and CD-Quality check with zero errors and 100% pass rate - however, during the last 5 or so % of the disc during these checks the drive slows down and varies in speed - but passes the test. This is worrying as the prior failures had serious problems in reading back in the Plextor but sometimes worked much better in a normal cdrom.
Nero said the last patch of data in one disc was unreadable but I got the data off in a normal cdrom and it is binary the same of the original. I have been burning other discs in between these problem ones so the drive seems fine.