cannot mount dvd

[Brian John]

Hello,
For some reason I can't mount a dvd in my dvd drive.  It is a normal 
data dvd that I burned using k3b.  This is what happens:
-bash-2.05b$ sudo mount /dvd
cd9660: /dev/acd0: Invalid argument

I also try this:
-bash-2.05b$ sudo mount -t cd9660 /dev/acd0 /dvd
cd9660: /dev/acd0: Invalid argument

Here is my fstab entry:
/dev/acd0               /dvd            cd9660  ro,noauto       0       0

Can anyone help me out?  Any clue why this might not work?

Thanks

/Brian