[HELP] USB to IDE Adapter Problem


I am trying to use an IDE to USB(2) adaptor with my Powerbook to transform an internal Dvd Burner into an external one.
Toast recognize it correctly.
When I try to burn a blank dvd process starts but, early or later, the progress bar pauses; toast keeps saying "Burning" but nothing happens and after 2 hours waiting I force quit.
I tried 2x and 4x. I tried using alternative burners like Yaburber and Disc Burner and Disk Utility making an Iso Image. Nothing.
I tried also changing the adaptor with a new one. Nothing.