Version:           1.0.5 (using KDE 3.5.10)
OS:                Linux
Installed from:    SuSE RPMs

First, when using my external USB DVD writer NEC DVD+-RW ND-6650A as normal DVD or CD reader works fine.
Burning CDs also works fine.

The problem is with DVDs:

When I insert a blank DVD, k3b will try to detect its possible write speeds. But when it does so, the writer restart over and over again. In k3b I can see alternatively "blank DVD-R", then "no DVD inserted", then again "blank DVD-R", then "no DVD inserted", it never stops. It means, once the write restarts, k3b will detect it again, and try to detect the speed again, which will make the writer restart, etc.

I tried doing some debugging and found out the following lines in k3bdevice.cpp in the determineSupportedWriteSpeeds() method:
      if( !getSupportedWriteSpeedsViaGP( ret, true ) )
   	   getSupportedWriteSpeedsVia2A( ret, true );

If I comment out the line with getSupportedWriteSpeedsViaGP() the problem disappears.

This is ok as a quick fix, but I think there should be another way to force either method for speed detection, for example using an option in the advanced configuration dialog.