Thanks, you cleared me up on that. Basically, it's ok to cross-switch the two (number wise) although it wouldn't be entirely efficient to do so.
To make it easier on myself, and most efficient, i'm matching up the numbers on the systems i'm building. The ultraDMA 133 mainboard is getting an ata 133 hard drive.
The only \"intuitive\" interface is the nipple. After that, it\'s all learned. ;)