I have a problem with my SONY DVD RW DW-U18A, It burns CD's fine, but when i attempt to burn a dvd it leaves a blank section on the resulting dvd. It has worked fine in the past. It is a recent issue that only started occuring. At first i assumed that it was the media, perhaps it was skipping bad sectors on the blank dvd. But this is not the case. The blank section on the burnt dvd's is on the same spot everytime. Some more information that might help is when i attempted to erase a dvd-rw to test out if it gets the same blank area, it stopped erasing at the same section the normal dvds leave blank.