I think thats just permissions problems I tried the same thing doesn't work for that folder. But if you create a new folder in the root of my home directory with read permissions for EVERYONE then it works fine. And then for getting to a volume i just tested this:
Alias /test/ "/volumes/Data/test/"
<Directory "/volumes/Data/test/">
Options Indexes MultiViews
AllowOverride None
Order allow,deny
Allow from all
</Directory>
Works just great. 🙂 And the volume in this case is "Data" as you could have guessed which is my second internal drive is called. Hope this helps.