c1d6s0 is a much clearer device name than sd0a; there's no special magic
for root or swap partitions, which makes sense; why have a weird special
case when you don't need it?  I can live with either; however, SVR4 let
me have 2 swap partitions on one drive when I needed to, and I can't see
an obvious way to do this in NetBSD.  (I know, you aren't likely to need
to.  But since when has Unix been a system that prevents you from doing
things just because they aren't *likely* to be necessary?)

-s