From: Bert Saenen <Bert.Saenen@skynet.be>

Bert> When I try to extract the NetBSD distribution sets I have to tell sysinst
Bert> where they reside, so I choose "installation from an unmounted filesystem"
Bert> (i.e. the 2Gb hfs+ partition); device = wd0e; filesystem = hfs+; direcory =

I don't think you can do that. Unmounted Filesystem should be 
NetBSD aware stuff, say
  CDROM manually mounted
  NFS manually mounted
  local another NetBSD partition (MacOS label is OK, but should be 4.2BSD
  partition)

HFS/+ partition may be accessible once you got NetBSD installed and with
/usr/pkgsrc/sysutils/hfsutils, but hfsutils is not yet consolidated to the 
installation environment, I am afraid.

---
Makoto Fujiwara
http://www.ki.nu/software/NetBSD/iBook2/