Yep, the usb external hdd works perfectly in windows xp environment. Basically to give ya a bit of background,... I origonally partitioned my 40gb hdd on my laptop. I put ubuntu on 1 part and windows xp on the other. In ubuntu, I had no problems with my external hdd then but I couldnt access the internet through my wireless card. So,.. I erased my entire hdd and just setup windows xp. I got vmware workstation to allow me to run ubuntu within the workstation within windows xp. As a result of this, my internet was now working through the wireless card. However, now my external hdd isnt. And that is where i am at now.