Mounting UFS partition

[Fernando Apesteguía]

Hi all,

I'm trying to mount an UFS partition from a FreeBSD 7.1 system, but
I'm getting this error:

kernel: ufs_read_super: bad magic number

I'm using this to mount the fs:

mount -t ufs -o ufstype=44bsd -o ro /dev/sda4 /mnt/FreeBSD/

Can't I mount the partition?

Thanks in advance