You probably don't want to bother with re-partitioning an entire drive 
until you are sure that NetBSD works on your machine.  In an earlier 
post, you said that you have a Centris 650.  Unfortunately, NetBSD will 
_not_ currently run on that mac.  There are several reasons for this:

1. ADB is not working as far as I know on this type of Mac
2. The scsi chip driver for the Centris's and Quadra's isn't done yet
3. Most importantly, as a couple of people who have '040 accelerators in 
their II-line macs, there are currently a few problems with memory on the 
'040 CPU.

Many of these are being worked on, but, as all of the work on this 
project is volunteer, it is sometimes hard for Allen, John, Bill, and the 
rest whose names I'm forgetting to find time to work on it.  However, 
Allen has said that he will be looking into #3 as soon as he gets back 
next week.

Hopefully, the '040 machines will work within the year.

I hope this answers some of your questions

Later.

-- 
Colin Wood                                      ender@is.rice.edu
Consultant                                        Rice University
Information Technology Services                       Houston, TX