Its actually 96GB free on the Surface Pro 128GB (source: http://www.zdnet.com/microsoft-officially-and-confusingly-di... ), and you can get it up to 104GB of free space by moving the recovery files (for if you need to reinstall the OS) off onto some other media. Of the 24GB still taken up, I gather some of that is because Office is pre-installed (but not activated) and presumably that can be removed too.