[newbie] Accessing Floppy / CDROM Disks

[SOverload]

Ok, I know this may sound really dumb but I cannot find anywhere how to 
access a floppy or cdrom disk.  I have both "Floppy" and "CDROM" listed in 
the "Mount" directory, but if I try to go into the directory and do an "ls", 
I get nothing.  I know I must be doing something really wrong, but I don't 
know what it is.