On Solaris 8 & 9, the first installation CD was
actually redundant - and a little flakey - so
you were better off starting with the second
CD.
In 8 & 9, they were called
-installation
-1 of 2
-2 of 2
and you only really needed the last two.
I've not tried this on Solaris 10, but it might be
worth a try.