just sharing my experience with this product. i have a shiny new laptop with the *ever-lovely* vista on it. inserted the expresscard - plugged in my new 250GB external hard drive - started clicking around but within 2 minutes got an I/O error. I unplugged everything, restarted and my hard drive now cannot be accessed. tried accessing my hard drive on different computers but to no avail.so buyer beware - i'm not 100% positive what caused this to happen, may have been a fluke, but its not worth finding out the hard way. find another firewire expresscard port and make sure that its vista compatible. or even better, remove vista all together from your machine