Driver, ничего хорошего
# mount -t ufs /dev/sda1 /mnt/usb/ -o ufstype=44bsd,ro
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
# tail -1 /var/log/messages
Sep 16 17:00:55 0day kernel: [ 585.371206] ufs_read_super: bad magic number