You have a portable SAS 15k rpm drive connected to the wiiu ?Yes there is here read this http://www.tomshardware.co.uk/sas-hard-drives,review-29677.html
So you bought an enterprise HDD for $$$$ and then you found a SAS enclosure for $$ to connect it to a USB 2 interface?
Even if the wiiu had an interface that could handle the throughput a $50 SSD in a $10 usb enclosure is faster.
So why ?