to display information about dvd drive and disk you can use dvd+rw-mediainfo command :
# dvd+rw-mediainfo /dev/dvd
it's not for dvd burn plugin
if you wanna work with dvd burn plugin you should install these files :
bzip2_1.0.5-r2_mipsel.ipk
cdrkit_1.1.9-r3_mipsel.ipk
dvd+rw-tools_7.1-r2_mipsel.ipk
dvdauthor_0.6.14-r2_mipsel.ipk
libattr_2.4.43-r0_mipsel.ipk
libbz2-1_1.0.5-r2_mipsel.ipk
libcap2_2.16-r1_mipsel.ipk
mjpegtools_1.9.0rc3-r0_mipsel.ipk
projectx_0.90.4.00.b32-r0_mipsel.ipk
python-imaging_1.1.6-ml1_mipsel.ipk
you can find them on Persian HD Project online server
good luck
actually you should only use dvd burn plugin with original enigma2 default skin (you can find it in dm8000 latest enigma2 files) , as i know dvd burn plugin just works with that
good luck