Can't see OpenBSD's slices

[Emil Mikulic]

ad1 is a hard-drive taken from an OpenBSD machine that had / and swap
and /tmp and /var and /usr on it (at least).  The machine it's now in is
running FreeBSD 6-CURRENT and it only sees one slice:

$ ls /dev/ad1*
/dev/ad1   /dev/ad1s4

I can mount this without any issues and it turns out to be the old root
filesystem.  Is there any way to get at the other filesystems on that
disk?

--Emil