I'm sure is not our PC configuration or fragmentation.
The only big problem is the drive.
If you look at the other forums (Lite-ON, Nec, etc) everybody is happy with their drives and there aren't this kind of problems.
Maybe in the firmware number 02576493746... they will find a solution for us. (Or maybe not, LOL).
Well, now I will wait for the dual layer DVDRW, and......BYE BYE BTC.