yo me iria por el WD, tiene mas scene detras de el (custom firmware) y ademas el seagate esta hecho para que solo puedas meter discos seagate en el,
its easier for me to explain it in english,
the actual shape of the hard drive aperture is shaped like the casing on the seagate freeagent 2.5" drive (atleast thats what i understood from the engadget review), so its the only model that fits, you could probobly do a work around with some cabling, but just go for the western digital and save yourself the mess,