Incorrect super block--help!

[Mark Space]

Hey, newb BSDer here with a question

I've got a brand new 5.4 install.  I'm trying to mount the CDROM.  As root, 
I type:

mount /dev/acd0 /cdrom

and I get "incorrect super block" error message after a bit of CD activity, 
and no mount.  I've tried a CD-RW I burned (the FreeBSD install disk I 
installed from) and an old copy of SimCity 2000, neither worked, same error 
message.

I'm stuck.  Any ideas?

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