LITE ON 20A1P DVD drive writes and verifies DVD's Data successfully using NERO, but to vain when reinserted to access DVD, drive shows the DVD as Coaster, of course I have up to 20 DVD Coasters like this, all burnt in this same LITE ON 20A1P DVD drive, sometimes burns to certain percentage like 23%, 11%, 8% and throws out DVD giving "Write Error" message, and to mention here, I even tried using Lens Cleaner and the result is same.
Also, firmware recently updated, media used in burning Sony DVD-R, Moser baer DVD-R, way back the same brands media was burnt successfully.
DVD Drive was bought an year ago, even writes and detects CD's successfully without any problems.