BD-RE mount problem
I've been using BD-RE discs for backups on a Debian/Squeeze server for a
couple of years now. In the last week or so the backups have been
failing. I haven't modified my backup script so I thought about possible
- I tried changing the BluRay writer but got the same problem.
- I tried new discs but got the same problem.
- I tried replacing the PCI-SATA controller that the machine needed for
the BluRay writer, but still got the same problem.
- the discs do formate correctly when I try dvd+rw-format -force=full
Finally, I tried an entirely different machine with a different model of
BluRay writer and I'm still getting the same problem.
This new machine has a different architecture (AMD64) and is running
Debian/Wheezy. Why am I getting the same problem?
I tried a new disc again, and this time formatted it through K3B instead
of using dvd+rw-format directly. It appeared to format correctly - and
no longer shows as an empty BD-RE disc when I insert it - but still
All the mount attempts give exactly the same result:
# mount /media/dvd
mount: block device /dev/sr0 is write-protected, mounting read-only
mount: wrong fs type, bad option, bad superblock on /dev/sr0,
missing codepage or helper program, or other error
In some cases useful info is found in syslog - try
dmesg | tail or so
The /etc/fstab entry is the same between the two machines:
/dev/sr0 /media/dvd udf user 0 0
I'm using Memorex BD-RE 2x discs. I've used an LG, ASUS and Pioneer
BluRay writer - the first two on the older machine. The ASUS and Pioneer
are brand new writers.