Herb recommended 2 drives-- could be FW or SATA as long as they are 7200 rpm or faster, 350GB each, I believe.
Here are some links to other similar topics with tips, suggestions, recommendations, etc.
http://community.vsl.co.at/viewtopic.php?t=7778
http://community.vsl.co.at/viewtopic.php?t=7428
http://community.vsl.co.at/viewtopic.php?t=7064
Paul's FAQ pdf for VI.
http://community.vsl.co.at/viewtopic.php?t=6909
Here are some links to other similar topics with tips, suggestions, recommendations, etc.
http://community.vsl.co.at/viewtopic.php?t=7778
http://community.vsl.co.at/viewtopic.php?t=7428
http://community.vsl.co.at/viewtopic.php?t=7064
Paul's FAQ pdf for VI.
http://community.vsl.co.at/viewtopic.php?t=6909