The answer is:
it should not have problems.
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Stephen gave this suggestion
> Do you think it may cause potential problems in the future?
	None that I can think of - as long as the filesystem is okay
	and you have the PROM set to look for the bootblock and kernel
	there.  ( I think that this is all done automatically when
	you do the install.)
	Having said that ...
	The only problem is with humans - we are used to seeing the
	bootblock and root partition at slice 0, and if the PROM is
	reset to defaults, it too will revert to slice 0.  If it was
	my machine I would reconfigure it just to prevent me from
	making a mistake at a future time when I may not remember that
	this machine is different than any of the others.
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I think he is right. I am reinstalling now.
thanks for: oster@bial1.ucsd.edu Dave
	    chris@inx.inx.net  Chris Spencer
	    spr@banjo.myxa.com Stephen
Thanks again.
Ying He