Then it looks like you've either miscounted or there's a firmware glitch with the drive.
I'll suggest the same as I did in a similar thread -
You can try the following - go to System Preferences > CD & DVD and set the DVD option to ignore. That will stop DVD Player automatically opening it (and then telling you it can't).
You can then try to open it with VLC or another third party player.
Incidentally, you may want to follow that thread, as Kurt188 says there may be a way round the setting, depending on models.