HotHardware: A side story that's been garnering a lot of attention is the amount of available storage space allotted to Surface Pro owners. The web cried foul when it was discovered that only 23GB of available space would be available on the 64GB model (36 percent of the advertised space), and 83GB on the 128GB (65 percent), but it turns out those figures were based on pre-production models that hadn't been fully optimized. Microsoft cleared the air in a Reddit AMA (Ask Me Anything) session, and now that the Surface Pro is available to order, the Redmond company decided to provide a few more details. (Gadgets, Microsoft, Microsoft Surface Pro, PC hardware)