I had some DVD+RW disks that were formated and written on a CyberHome Recorder. Then I could not erase them on the PC using Nero 9, in fact it would actually hang Nero 9. Nero 9 would not restart correctly until I rebooted the PC. Then I used ImgBurn to write a Video file to the DVD. ImgBurn then formated the DVD and wrote the files. Then using Nero 9, the erase worked fine, both the quick and full erases.