Mounting UDF formatted DVD+RW in read-write mode

Hi folks,
I'm having trouble getting Leopard to mount a freshly formatted UDF DVD+RW in read-write mode. It always seems to come up mounted read-only regardless of the options I give mount or mount_udf. I've tried default and 2.5 versions of UDF, specifying fix-packet when creating the volume, specifying -w on mount_udf, specifying -o w on mount, etc.
The disc seems to be created okay, and shows free space..Just can't figure out how to use it. Any thoughts/working recipes? Example transcript follows..
Thanks in advance,
- Zanthrox
scutter:~ doucej$ newfs_udf -v "Backup" /dev/disk1
write to block device: /dev/disk1 last written block address: 2295103
scutter:~ doucej$ mkdir /Volumes/Backup
scutter:~ doucej$ sudo mount_udf -w /dev/disk1 /Volumes/Backup
scutter:~ doucej$ df
Filesystem 512-blocks Used Available Capacity Mounted on
/dev/disk0s2 454819840 320448088 133859752 71% /
devfs 213 213 0 100% /dev
fdesc 2 2 0 100% /dev
map -hosts 0 0 0 100% /net
map auto_home 0 0 0 100% /home
/dev/disk0s3 32905496 32284360 621136 99% /Volumes/Untitled
/dev/disk1 9178360 572 9177788 1% /Volumes/Backup
Looks good so far -- the volume was created fine, is readable, mountable, and shows free space..
scutter:~ doucej$ mount
/dev/disk0s2 on / (hfs, local, journaled)
devfs on /dev (devfs, local)
fdesc on /dev (fdesc, union)
map -hosts on /net (autofs, automounted)
map auto_home on /home (autofs, automounted)
/dev/disk0s3 on /Volumes/Untitled (ntfs, local, read-only, noowners)
/dev/disk1 on /Volumes/Backup (udf, local, read-only)
scutter:~ doucej$
....but it still won't come up read-write, so I can't actually use it.

If LVM has dropped write permissions on a volume or group then its probably for a good reason. You might want to look at the root cause for the failure and check /var/log/messages for any information.
If you don't care about the data, you might be able to to bring back write access using
<pre>
lvchange --ignorelockingfailure -p w VolGroup00-LogVol14
</pre>
But like I said, there is probably a good reason why the volume is write protected in order to prevent further damage, or because of a underlying hardware issue.

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> No, but strange as it seems, it does have to open it
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> baFileExists(), baDeleteFile().
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