First, I'm assuming the cd/dvd drive is cd-rw and dvd-rw capable (can read and write cd/dvd).
Second, you need to check your /etc/fstab for the cd/dvd writer mount parameters. It should look something like
/dev/dvdrecorder /media/dvdrecorder subfs noauto,fs=cdfss,rw,procuid,nosuid,nodev,exec
Note the rw in the mount parameters. It yours reads ro, then it's mounted 'read only' and won't write.
There's also that issue of 'Does not appear to be recordable media'. The disk you are trying to write may be bad. Have you tried others?