making a disk/slice bootable

I have been mirroring the virtual disk in a FreeBSD vm for a couple of
years and the main disk got corrupted. The mirrored disk doesn't boot, says
it can't find a kernel, so I think I missed out on an additional
step, writing an MBR or boot sector, perhaps.

The files are all there if I mount them from a VM with FreeBSD.I assume
there is a way to make a mountable disk bootable.  fdisk and gpart are
available but it's been a long time since I messed around with those.



-- 
Paul Beard / www.paulbeard.org/