Can't read K3b burned [backup] DVD

[Nigel Ridley]

I just burned a Teac DVD+R x16 RW with all my important files as a 
backup - trouble is I can't get it to mount. It doesn't auto-mount and 
other DVD's that I have made in the same way, albeit from Philips, do 
auto-mount.
I also can't mount it manually:

nigel at nigels:~$ mount /media/cdrom0
mount: wrong fs type, bad option, bad superblock on /dev/hda,
        missing codepage or other error
        In some cases useful info is found in syslog - try
        dmesg | tail  or so

nigel at nigels:~$ dmesg | tail
[520933.268395] hda: rw=0, want=1252, limit=4
[520933.268464] attempt to access beyond end of device
[520933.268540] hda: rw=0, want=1028, limit=4
[520933.268604] UDF-fs: No partition found (1)
[520938.294802] hda: irq timeout: status=0xd0 { Busy }
[520938.294808] ide: failed opcode was: unknown
[520938.342729] hda: ATAPI reset complete
[520938.360197] attempt to access beyond end of device
[520938.360281] hda: rw=0, want=68, limit=4
[520938.360344] isofs_fill_super: bread failed, dev=hda, iso_blknum=16, 
block=16
nigel at nigels:~$

Is it a coaster? Is the problem Teac? Is there another option?

TIA

Nigel

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