How do I change the document root for lighttpd?

Question

I am trying to change my lighttpd configuration as follows:

I have a 500GB ext4 formatted hard disk attached to my server via USB. I would like to either

a) Change my lighttpd server's document root to /media/adam/Server/http (a real folder on my hard drive)

or

b) Symlink that same folder to /var/www and have it work properly (e.g. going to localhost/http/somefile.html would have somefile.html show up).

/media/adam/Server/http is set to chown www-data:www-data, chmod 775. When browsing to a file, I get error 403 Access Denied.