Accessing BSDi Diskslices On Non-BSD OSes?

The Madpostal Worker asks: "My school has an old BSDi 3.0 machine that is slowly going downhill. Now ideally we would like to replace it with a Linux or FreeBSD machine, but I have yet to find a way to read the BSDi disk slices from any other operating system. Has anyone done this before? We are short on hardware, and have quite a bit of data, so a simple copy is out of the question. We really just want to be able to mount the drives from a free operating system. Looking around online has been unhelpful, BSDi 3.0 is old enough there is little support. Anything would help, if only even what scheme BSDi uses for diskslices."