Need advise on how to mount certain CD's

[Leslie Jensen]

Hello list

I've got a CD-R from a friend, (who runs windows) that I cannot mount on 
my 7.2-RELEASE system. It's readable in another windows machine.

Other CD and DVD's is no problem but this one is.

The error I get is:

mount -t cd9660 /dev/acd0 /cdrom
mount_cd9660: /dev/acd0: Invalid argument

I've Googled and read the handbook but I think my settings are ok.

Any suggestions?

Thanks

/Leslie