I believe dos looks at the primary partitions on the first two
physical drives first, then finds any `extended' partitions and uses
the logical partition info within those to continue to assign letters.

For example, if you have two drives, each with a primary and one
extended with two logical volumes, I think it ends up being like this:

Drive 0:	Drive 1:

(pri)	c:	(pri)	d:
(logic) e:	(logic)	g:
(logic) f:	(logic)	h:

It's been some time though since I've played with these things.  :)

--Michael

--
Michael Graff <explorer@flame.org>        NetBSD is the way to go!
PGP key on a key-server near you!         Netshade the world!