> What is the result if root runs disklabel, and forces it to all zeros?
If the root duid is all zeroes, then the only way to refer to the root
disk is to use its /dev/{s,w}d* device name, as zero duids are ignored.
If you set a zero duid in disklabel(8), setdisklabel() in the kernel
will compute a new, non-zero value.
