I recently installed a SATA drive and after running SiSandra I saw this warning:

Warning W3104 - Current transfer mode not optimal, i.e. not highest supported. This affects drive performance. If the controller is also capable of the highest supported transfer mode, there is no reason not to use it.

Fix: First check controller supported transfer modes. Then check the mode the driver for the controller/BIOS is set to use and modify; some default to a lower mode for compatibility. You may need to install newer drivers if the current drivers do not natively support the controller (especially for RAID). You may need to update the controller BIOS or drive firmware, if the mode does not stick. If data corruption occurs verify the cable and consider switching (if any) drives on the same channel onto other channels.

If the built-in controller does not support the mode, consider using the on-board/RAID controller or even disable the built-in controller and install a new controller.

MB is an Asus P5P800 and my configuration is this.

One WD 160G ATA100 HD on IDE Channel 1
One DVD-RW on IDE Channel 2
One WD 160G SATA HD on SATA Channel 1

In the bios the only option I have for UDMA on the Sata drive is up to UDMA5 and it I ran WD Li[censored]uard and it supports UDMA7.

Also the WD site says to get the bios and Windows to recognize it as a SATA drive to jumper pins 5-6 but that had no effect.

How would I begin to diagnose this and what should I look for?