can be done with UDFS and DVDRAM
==> blank DVD disk in DVDRAM device /dev/cd0
udfcreate -d /dev/cd0
mount -v udfs /dev/cd0 /mnt_dir
Then /mnt_dir works like any other disk FS (beit a bit slower than you are used to). Meaning you can create a tarfile or BFF file on it with wathever in it you like. and then another, and another, just keep adding until the DVDRAM disk is full...
HTH,
p5wizard