I'm slightly fuzzy, but disk layout is generally: 0: 1st-stage boot 1: disklabel 2-15: 2nd-stage boot 16-N: filesystem In other words, the first 16 sectors of a ffs filesystem are left empty for boot/disklabel stuff. So if you know what the fs layout is (perhaps just one big fs), you should be able to write the disklabel without breaking the fs. (via rsd0c presumably, which is whole disk on sparc, again if I remember right)
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