I wrote an image to my new DVD+RW (SONY) and afterwards, no DVD drives were able to detect the disc. So I decided to erase the disc. But now, I am not able to erase the disc as well! I have tried with Roxio & Imgburn. Roxio just gets stuck, but Imgburn shouts "Oh no!!!" with an error message box saying "No reference position found".

Is there a way to reformat / erase this disc or it became useless already?