Iâ€™m using old Teac W512EB cd-burner and LiteOn 1653 dvd-burner. I have a lot of no-name CD-R discs. The disc surface looks like metal-AZO. Nero CD-speed and kprobe quality test results are strange â€“ 0 C1, and average (!) 80 C2 errors, but there is no problem with reading of data. What thatâ€™s mean???