Invalid partition table after sysinstall modifications

[Doug Poland]

Hello,

I've got a 4.9-STABLE system that was dual-booted between FBSD and 
Win2K.  I had no further need for the windows slice so I used sysinstall 
to delete the NTFS slice, write it as type 165, newfs'd it, mounted it, 
and wrote a bunch of data to the new ufs slice.  So far so good... 
About 8 hours after this procedure the system hung, I rebooted and 
received the message,

   "Invalid partition table"

I was able to boot the system with a FreeSBIE live bootable CDROM and 
fsck all the ufs slices.  The data on all slices appear to be good, but 
I cannot figure out how to get this box to boot again.  I've google'd 
and read the appropriate handbook sections.

This box isn't that important and I could just copy off the data I need 
and re-install the OS.  However, I'd like to figure out what went wrong 
and fix it the *right* way.

Many TIA,

Doug