I subsequently ran e2fsck with various parameters all returning the same message. This was the last:
# e2fsck -c -f -k -p /dev/sr0
e2fsck: Attempt to read block from filesystem resulted in short read while trying to open /dev/sr0
Could this be a zero-length partition?
It's highly unlikely the DVD contains an ext2/3/4 filesystem. It's a 99% probability it is iso9660. I don't know of a fsck method for the iso9660 filesystem.
To blank the optical disk, you need to know what bus device your recorder is. Open a terminal and enter:cdrecord -scanbus
Your results will be similar to:
4,0,0 400) *
4,1,0 401) 'ATAPI ' 'DVD A DH20A4P ' '9P59' Removable CD-ROM
4,2,0 402) *
4,3,0 403) *
4,4,0 404) *
4,5,0 405) *
4,6,0 406) *
4,7,0 407) *
If you had the same setup as mine, your recording device number would be 4,1,0. Using mine as an example, do in a terminal:cdrecord blank=fast dev=4,1,0
cdrecord blank=all dev=4,1,0
blank=fast will do a quick reformat. blank=all will do a full reformat. If you get erors, try this one:dvd+rw-format -force /dev/dvd
If none of those work, it is almost certain that your optical disk has become defective or the recording devices has.