Hi,
[i am subscribed to cdwrite@other.debian.org, not to debian-user]
I tried a new disc again, and this time formatted it through K3B
instead of using dvd+rw-format directly.
I don't know what K3B does as "formatting", but dvd+rw-format does
only a hardware level formatting. It does not create a filesystem.
Further to above, I did a file copy using K3B onto one of the BD-RE
discs that won't mount. K3B appeared to recognize that there was a
udf file system on the disc.
I would rather expect that it created one around the files which
you told it to copy.
After it finished, it automounted as /media/cdrom0 with fs type
iso9660.
So it is probably an ISO 9660/UDF hybrid filesystem created by
mkisofs (which was started under the control of K3B).
However, I can't mount it -rw. It insists that the file system is
read-only.
This is not the variant of UDf which you want.
You want a read-write filesystem.
root@transponder:/home/garydale# mkudffs /dev/sr0
Error opening device: Read-only file system
This should have worked.
Do you have no w-permission to /dev/sr0 ?
I just exercised with success:
mkudffs /dev/sr1
mount /dev/sr1 /mnt
cp /some/dir /mnt
umount /mnt
Hardware:
INQUIRY: [HL-DT-ST][BD-RE GGW-H20L ][YL03]
Mounted Media: 43h, BD-RE
Media ID: VERBAT/IM0
(Not that i ever would do that for backup. The umount time alone gives
me creeps. No chance to get full write speed. Arrrgh !!!
I use my own ISO 9660 multi-session tool xorriso for backups.)
Here's the dvd+rw-mediainfo:
root@transponder:/home/garydale# dvd+rw-mediainfo /dev/sr0
READ FORMAT CAPACITIES:
formatted: 11826176*2048=24220008448
Well, it is already formatted. That should suffice for a whole
media life. The problem is to get mkudffs to work.
Maybe it is reluctant to overwrite a valid ISO 9660 or UDF on the
medium ?
Try to overwrite it by brute force
umount /dev/sr0
dd if=/dev/zero of=/dev/sr0 bs=2048 count=1024
mkudffs /dev/sr0
If 1024 blocks of 0s is not enough, then try to flood the whole medium
dd if=/dev/zero of=/dev/sr0 bs=2048 count=11826176