I just bought a NEC ND 3570A (original firmware 1.11). I tested it with Nero CD-DVD speed (v4.51.1) and made a “Create disk” test with a DVD-R 4x (no name) and DVD+R 16x (MCC004). The result is strange because the buffer goes down about every 500MB. So I can’t believe that media are not good quality. I made a defrag and shuted down all not-important processes (like antivirus, fire-wall…) but nothing changes.
When I make a “disk quality” test of burned DVDs, we can see that at every 500MB there is a spike of PI failures.
Have you got an idea about it?