I tested the CDF modified version of the firmware, but it didn't solve the problem.

I tested the drive connected on an external box, but any -R disc burned by this drive, even with SB01 original firmware, still have a bad written lead-in.

All -R discs burned in this drive are still seen as empty media by the samsung, but can be read by other drives.

I have a nforce2 mainboard, but I didn't tested the drive internally.

Moreover, this drive is not able to write RAM discs, whereas the same disc was written without any problem by my Sony 170.

I returned again the drive to the store, but I'm sure that it will not solve the problem. I lost my money, and never will buy again in that store

As a sidenote: even if the drive is connected on an external box, the flasher do a computer reset at the end of flash, without giving any possibility to simply unplug the drive. That's really annoying