Accessing DOS partition from RPi

I can't work out how to access the DOS partition on my FreeBSD RPi sdhc card...

gpart show:

mmcsd0 MBR
1 !12 [active] 50M

Should I be able to mount it using something like:-

mount_msdosfs /dev/mmcsd0s1 /mnt ?
Are you running this as root? If not, is user mounting (vfs.usermount) enabled? Who (user/group) owns the devices and mountpoints?