DVD+R Writer Problems

Hi Group, I've got a Fujitsu Siemens V2020 Laptop running Suse10. The other night I managed to write a DVD to a verbatim dvd+r disk. Now when I try and write another disk, it does not recognize the dvd+r disks anymore. The DVD drive is a HL-DT-ST DVD-RW GCA-4080N which is a dual format dual layer DVD writer. The firmware running on the drive is 0w33. Any help on what I can try will be appreciated. Stephen