I've opened the burner and cleaned the "pistons" and the lens (that wasn't dirty), but it hasn't changed. I've tried another iso and the burning started but then stopped at 28% with the same error (but different sectors). Here's the error window : http://i37.tinypic.com/w7h7cw.jpg
I've tried to burn the first iso with Nero and it was successful, but I would like to use ImgBurn.
Could be the burner broken ? It also makes strange noises often. Thanks for the help.