In case anyone is wondering whether the excellent G-Raid portable Firewire 800/400/USB drives can be upgraded with bigger hard drives, the answer is: yes they can! At present the largest G-Raid portable drive (twin drives in Raid 0 configuration in a portable enclosure) is 500GB. In the enclosure are two 250GB drives. I bought one of these enclosures and replaced the 250GB drives with Western Digital 320GB drives, so now I have an external drive of 640GB. There is a slight power issue which I've managed to find a work-around for in case anyone wants to repeat this exercise. As soon as the Samsung Spinpoint M6 500GB drive is actually shipping, with 9.5mm height, we *should* be able to get a portable drive of 1TB capacity, although until someone actually tries it we won't know if there will be enough power from the Firewire port for two of these drives running simultaneously. (Note that opening the case of the G-Tech G-Raid mini invalidates the warranty, although the swap is straightforward and not that much more difficult than on a standard single drive enclosure.) In the meantime, note that the G-Raid Mini 500GB external drive can still hold its own, despite the introduction of 500GB laptop drives, since its Raid 0 configuration makes data read and write operations significantly faster than with a single drive.