ubuntu@ubuntu:~$ sudo mount /dev/sda1 /media/a
mount: /dev/sda1 is write-protected, mounting read-only
mount: wrong fs type, bad option, bad superblock on /dev/sda1,
       missing codepage or helper program, or other error

       In some cases useful info is found in syslog - try
       dmesg | tail or so.

nark