Very interesting. I've been very interested in hard drive performance ever since i got my first comps. I was pretty appalled with Vista's copy performance, but Sp1 seems to optimized it a bit better. Win7 seems much better. I'm currently going through Mark Russinovich's Inside Windows to get a better knowledge of whats going on deep in windows. I'm going to try do a few tests myself with XP, Vista, and 7beta. I have a huge bunch of hard drives including Fujitsu 15k MAUs, Seagate 15k.3s, 7200.9, 7200.10, 7200.11, Hitachi 1TB, WD 1TB Green, WD Blacks and Scorpio. Would be interesting if i can get some consistent results. Any tips on what kind of tools i should use? I've been using Teracopy for a while, but 2.0 doesn't let you change buffer sizes easily anymore. I've tried all the other copy tools, but always go back to teracopy.