Hello I,m new to DVD recording but not to computers in general. Just bought a pioneer A04 and installed it OK , but to test my DVD recordings for compatibilty with stand alone recorders after burning, bought some DVD-RW disks so I could erase them afterwards. Well thats the problem, For some reason after inserting a disc using Nero and Discjuggler, to burn an image, something has got recorded and the disc is now unusable. How do I completely erase these disks, and do I have to format them befoe burning image files to them. Thanks:(