Hey just coming into this conversation. Here is an Idea.. Why not install a SATA card into the machine, one that supports AHCI. I'm guessing there is a free PCI or PCI-E slot.
They are made, here is a link, I found quickly with a google search.. Bang for buck, it could be the cheapest option.
http://www.lycom.com.tw/PE-126.htm
http://www.lycom.com.tw/PE-125.htm ( Better card )
It could save a bunch of headaches.
On your 2970 which series are you running? II or III
John