you are using the wrong sata drivers. ive had the same problem on my k8v se deluxe. even though the windows installation accepts the drivers, it wont detect it. i dont remember the exact driver i used, but i recommend trying these:
http://www.asus.com/support/download...0d.zip~zaqwedc
http://support.wdc.com/download/ctlcard/Drivers.zip
http://www.asus.com/support/download...28.zip~zaqwedc
http://www.asus.com/support/download...37.zip~zaqwedc
hope this helps