Hi Bob,
if u followed Michiel howto, u should b almost there. By mounting the new HD in /home/e-smith/files/ibays u can now create any ibays and it should be showing there on the new drive. You will not see ur drive in Windows until you share something. Remember Samba?
Boris said to create a new ibay named 'mynewdisk', so if u go into
http://your.domain.name/server-manager u should see a menu on the left hand side named 'Information Ibays'. Once in there u can create an ibays named 'mynewdisk'. Done that, fire up Putty or any SSH client and when connected to your SME Server at the command line type (warning: if u screw this up it's only ur problem, don't blame any one else) #pico /etc/fstab.
make the modification suggested by Boris and get help also from Michiel how-to (all info is actually there, u just have to customize it to ur needs).
Once u've done that u r good to go
Hope that helps,
Italo