I think your DVD drive is knackered, but I could be wrong.
Reading a disc, and writing to a disc are different things. I've seen many drives that would read a disc, but fail to burn.
Try this ,open a terminal and typepaste the output back here.Code:sudo lshw -c cdrom
It's okay, I'm a limo driver
Hi I have come across this problem I got round it by blanking the disc using nero on xp machine
DUAL BOOT XP & Natty, Trying LFS
Have you formatted the dvd-rw disk? Also maybe just try a dvd-r.
FIC K8-800T AMD64 3200+ 2GB PC3200 GeForce 6800GT Mandriva 2010 KDE+Compiz+Emerald
MSI K9N2GM AMD 9950BE 4GB DDR2-800 GeForce 8200 10.10 WUSB600N
Acer 6920 Core 2 Duo 4GB GeForce 9500GS 10.04 Ubuntu User #17586