Well, I'm currently researching how to Hot Swap removable IDE drive bay systems for someone and came across this on the Microslop website. I found this by accident(as usually the case!)

http://support.microsoft.com/default.aspx?scid=KB;EN-US;Q322359&

Interesting to know that the wrong PCI ide controller driver is installed! This may be the reason for some wierdness on some drives not being able to use proper UDMA settings!

Also found this:
http://support.microsoft.com/default.aspx?scid=KB;EN-US;Q323760&

Just some good reading stuff. and also some info for the archives of this wonderful forum!
Peace and Enjoy!
Opus :D