Could be a couple of things.

Can you test booting the dss usb on another system?
if it works then the image is ok
if not try downloading and reinstall again.
verify the file size of the dss image on the wed site the same after download?


What is the supermicro motherboard model number?
is the firmware on the motherboard up to date?

the Areca 1222 is not on the hardware compatable list.
http://www.open-e.com/service-and-su...re-raid/areca/

try testing with software raid

Good luck