Nao consigo gravar DVD de dados Debian 2.6

Pessoal

Estou tentando gravar um DVD com o backup do servidor,mas nao consigo. Se alguem puder me ajudar fico grato.
Vejam a minhas opcoes:
1) /boot/grub/menu.lst
na linha kernel coloquei hdd=ide-scsi
2) /etc/modules
ide-scsi
sg
3) dmesg | grep hd
hda: ST380011A, ATA DISK drive
hdd: HL-DT-ST DVDRAM GSA-4163B, ATAPI CD/DVD-ROM drive
hda: max request size: 1024KiB
4) dmesg | grep scsi
Kernel command line: root=/dev/hda2 ro hdd=ide-scsi
ide_setup: hdd=ide-scsi
ide-scsi is deprecated for cd burning! Use ide-cd and give
dev=/dev/hdX as device
scsi0 : SCSI host adapter emulation for IDE ATAPI devices
Attached scsi generic sg0 at scsi0, channel 0, id 0, lun 0, type 5
sr0: scsi3-mmc drive: 62x/62x writer dvd-ram cd/rw xa/form2
cdda tray
Attached scsi CD-ROM sr0 at scsi0, channel 0, id 0, lun 0
5) dvd+rw-format -force /dev/sr0
mounted media doens't appear to be DVD+RW
6) growisofs -dvd-compact -speed=1 -Z /dev/sr0=tmp/backup.iso
unable to open64("/dev/sr0=/tmp/backup.iso",O_RDONLY):
No such file or directory
7) se eu usar mkisofs sem growisofs funciona veja:
mkisofs -R -J backup.zip > /dev/sr0
Onde estou errando, pois ja usei varias scripts e tutoriais da internet, mas nao estou conseguindo concluir.

Laercio