mounting DVD

["Jeremy C. Reed" <reed%reedmedia.net@localhost>]

I have a DVD disk supposedly containing image files (provided by a 
photographer). In small printing it shows a part number: 
cpdr47g-cdmwpo2-114. I think it is a DVD+R, but I don't know.

I can't mount it. On a NetBSD/amd64 5.0_STABLE (May 11 2009), I 
get:

 mount_cd9660: /dev/cd0a on /mnt: Invalid argument

ktrace tells me:
 22349      1 mount_cd9660 RET   __mount50 -1 errno 22 Invalid argument

mount_udf fails with:

mount_udf: Cannot mount /dev/cd0a on /mnt: Operation not supported by device

My DVD drive works. I can mount CDs and play DVD videos (with mplayer).

Any ideas on how to troubleshoot mounting a DVD?

The device is:

cd0 at atapibus0 drive 0: <MATSHITADVD-RAM UJ880AS, UF83  289387, 1.50> cdrom 
removable
cd0: drive supports PIO mode 4, DMA mode 2, Ultra-DMA mode 2 (Ultra/33)
cd0(ahcisata0:5:0): using PIO mode 4, DMA mode 2, Ultra-DMA mode 2 (Ultra/33) 
(using DMA)

I tried:

  sudo mount -t cd9660 /dev/cd0a /mnt

  sudo mount_udf /dev/cd0a /mnt

and also tried cd0d

I also tried same DVD on a different system (amd64 5.99.22 kernel but 
older 4.99 mount) with:

cd0 at atapibus0 drive 0: <MATSHITADVD-RAM UJ-850S, HB88  482625, 1.21> 
cdrom removable
cd0: 32-bit data port
cd0: drive supports PIO mode 4, DMA mode 2, Ultra-DMA mode 2 (Ultra/33)
cd0(ixpide1:0:0): using PIO mode 4, Ultra-DMA mode 2 (Ultra/33) (using 
DMA)

$sudo mount -t cd9660 /dev/cd0d /mnt 
mount_cd9660: /dev/cd0d on /mnt: Invalid argument

$ sudo mount -t cd9660 /dev/cd0a /mnt 
mount_cd9660: /dev/cd0a on /mnt: Device not configured