So looking at device manager, I see that mine is a Micron c400-mtfddac064mam mSATA 64GB drive. This model number matches directly with a removable storage that you can purchase at online retailers and can be found on ebay as well... Anyone crack open their Surface Pro yet to see if this drive can indeed be upgraded? The C400 drives go up to 256GB. If this is indeed true, would this make the Surface the first (and possibly only) upgradable tablet? iFixit needs to get on this immediately!