My great Sony DVD drive burns DVD+R mostly up to 80% and then provides me with an WRITE ERROR. It does burn CD-R/RW ok. In my computer is denotes the drive as a CD Drive. I use Nero 6, but Roxio 7 gives the same message. HELP. Or is my drive just physically f...ed up ? I have upgraded to 1.0f (Firmware). In the Recording Tab the box is unticked for burning CD's.