opendarwin floppy or zip boot disk

Hello.

I am farily new to Opendarwin and have installed it a
couple of times, installed software on it etc.  

What I am wondering is, if there is the equivalent of
the dd command in opendarwin in order to make a floppy
or zip drive boot disk.  

I am asking this as opendarwin will not boot using
grub as it tells me there is no ufs partition. 
However, if I boot from the cdrom and issue rd=disk0s3
then opendarwin boots just fine, but I can't control
the boot files.  I have seen the previous posts about
grub and booting and have not seen this error so I am
not sure what it means.

Leo


		
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