BURN OPTICAL MEDIA

$ time growisofs -Z /dev/sr0 -R -J -joliet-long -V "label"  "$(pwd)"
$ time dvd+rw-format -Blank /dev/sr0

Need to test

dd if=/dev/zero of=file.iso bs=1M count=19000
mkudffs --vid=CDTITLE file.iso
mkdir /mnt/loop 
mount -o loop -t udf file.iso /mnt/loop 
cp big_file /mnt/loop 
umount /mnt/loop
growisofs -speed 4 -Z /dev/dvd=file.iso