I know that SATA is supposed to be faster than Ultra ATA 100 or 133. I read a review/comparo in PC Modder (CPU mag) that tests all different types of drives and in real world benchies there wasn't much diff. if any. I got some massive deal on a 160 GB Ultra 100 and got home before I realized I wanted an SATA. Now I'm trying to decide if I should return it for an SATA. If there's much of a diff. I'll get an SATA. I really only care about gaming FPS and secondarily load times.