Microsoft commented on the battery and memory on your Surface Pro
We have already noted that the operating system along with pre-installed software occupies half of the available memory in the RT version of the tablet, but consumers are hoping that with the Pro version, the situation is different. Unfortunately, the facts show that the first units of the Surface Pro with 64 GB of memory, I suggest only about 30 GB of free space.
During the session with questions on Reddit, Microsoft explained that in addition to the operating system, there is an additional section that is used for system restore, but it can be removed, which will free up additional space.
Microsoft did not remain silent in relation to the battery on the Surface Pro, which, according to the company, provides more battery life than the MacBook Air, for example. However, the tests edition The Verge showed that from the battery, the tablet runs for 3 hours and 59 minutes, while the 13″ MacBook Air has 5 hours and 34 minutes. This means that the Microsoft statement is not true, respectively, and in relation to the 11-inch MacBook Air models.
: The Verge