After re-allocating space from the recovery tool:
64GB = 40GB free space
128GB = 104GB free space
That means that the system is taking 24GB of space for a device that was originally marketed as a tablet. They then changed the marketing to 'laptop in tablet form' because they got crap for heating issues, battery issues, and space issues.
Say what you will, but this was originally meant to be a mobile device the amount of space it takes up is ridiculous.
I didn't either when my work gave me it, but it's currently just collecting dust with my other gadgets
.