k3b error "erasing failed" on blank DVD+RW

i am having trouble burning an iso file to a blank dvd-rw in k3b.
i am running suse 11.1 with kde4.1 and i am using a new blank dvd
+rw. after clicking start a window pops up stating: preformatting dvd. after a few minutes i receive the error message: erasing failed. ive burned iso’
s and video files successfully with k3b before without this issue.
thanx in advance for helping.