It seem i have 2 problems.
If the iso image is too large, K3B does not say so. It acts as if it did not see the blank DVD.
I am not sure but some tests might have been done with images for double layer.
This could explain some of my failed tests. I tried so much options that i am not sure if
there is not something else too. I can now burn DVD’s though, the main objective.
With the internal LG drive (GH22LP20) and K3b i cannot erase or write on CD-RW. WIth the external
USB DVD Drive (TSSTcorp) i can write the CD but the behavior is strange. It start by trying to erase
the CD-RW, report a failure but proceed with writing the iso image normally. I am not sure the internal
drive is defective of if it is K3B that cannot handle it well.
Thanks a lot for the suggestions.
Sylvain