Booting straight in disk with install ofwboot.elf iso.

Hi,

I found a tutorial which teach how to install NetBSD macppc in a Mac =
mini G4 1.42 GHz booting straight with ofwboot.elf iso insert in disk. =
However, when I try to use disklabel after to execute dd command, =
disklabel doesn=E2=80=99t record my edition in disk (it says which there =
is an inconsistency between disk and label or something like that).
I have some doubts! Is it necessary which disk had a scheme (possibly =
APM) or can disk be raw?
If first case is correct, is it necessary that scheme disk must be set =
with MacOS's Disk Utility or can I use pdisk's "i" command to set MacOS =
partition (bootstrap?)?=20=