I'm sure everyone else has noticed this one too. When there's a lot of hard disk activity (let's say we move a 1GB file to another HD, or defragment a HD), XP gets really non-responsive and user has to wait for disk processes to stop. You can move the mouse around but that's about it. This annoyance has been around in every Windows version I've been using, but I haven't noticed such thing in Linux. I guess there must be some architectural difference. I only hope that in the next version (Longhorn) this problem will be no more..