I try to do the same, and get the following errors. could someone tell
me what i'm doing wrong?

[root@ksi4 /dev]# cdrwtool -d /dev/cdrom -q
    

That only works for CDRW's
oh.. hehe... now i feel a bit silly..

If I use Andy's dvd formatting tool (dvd+rw-format) 'dvd+rw-format -f
/dev/cdrom' I get this:

[root@ksi4 /root]# dvd+rw-format -f /dev/cdrom
* DVD+RW format utility by <appro@fy.chalmers.se>, version 2.0.
* 4.7GB DVD+RW media detected.
* formatting 1.6\

one question: why does the formatting only go to 1.6%?
    

Cause it's supposed to auto extend the format as you write to the disc.

Thats why I suggested dd-ing the whole disc, then trying to mount it
and copy the file. Then you'd know the whole disc had been formated,
and it wasn't a problem with the format extension.

Ben
I've done as you suggested :
dd if=/dev/zero of=/dev/sr0 bs=2048 count=2295104
but since i don't have sr0 in my /dev dir, i assume it's supposed to be scd0.
[root@ksi4 /root]# dd if=/dev/zero of=/dev/scd0 bs=2048 count=2295104
dd: /dev/scd0: Read-only file system
So then i try to do this :
[root@ksi4 /root]# mkudffs --media-type=cdrw /dev/cdrom
trying to change type of multiple extents

--

As  you can probably see, i'm a bit confused with the whole thing. What should i do now?

cheers,
guStaVo