Change to use only geom and GPTs for FBSD 10 and above.
As of FreeBSD 10, I am tired of fighting the old MBR tools. So for whole disks (slice == 0) we are going to use GPT so that we can get good (1M) alignment and potentially big-ass partitions with a minimum of fuss. This means that you cannot image those partitions since imagezip does not yet (as of 05/2014) understand GPT. But we have no mechanism for capturing an image from anything but the system disk anyway, so we can live with this until GPT support is added.
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