your sata drives dont have jumpers for master / slave
you can get sata enclosures to run a sata drive externally; they do not use the USB bus but rather instead they run externally off the sata controller :)
I would also do as the post above says; and install some of your sata drives intenrally also to get use from as many drives as possible
you will need to buy one of these to connect your external sata drive enclosures
http://www.satacables.com/html/sata-pci-brackets.html
http://www.newegg.com/Product/Produc...82E16812119021