I'm not sure how, but I have achieved this: >> gpart show ad1 => 34 976773101 ad1 GPT (465G) 34 976773101 1 freebsd-ufs (465G) ... which is correct, except for the size. I have a new problem: >> newfs /dev/ad1p1 newfs: wtfs: 512 bytes at sector 976773100: Input/output error Robert Huff