Thanks Wolf. didn`t find anything though. I`ve had this prob a few years ago & I think it was a service prob, but toooo long ago 4 this ole brain. Thanks also LLXX. XP loads drives as UDMA by default, & it`s not an option within XP. I`ve even reloaded the latest chipset drivers, hoping one may have failed, but NO!!. Seems like it`s a memory prob???. Once "Explorer" gets going, everything is fine. Just hate sitting here 4 10 mins waiting. EDIT:- The bios tells me all three drive are UDMA 5