A:Answer That depends on how much you save to the hd. Normal win 10 updates over a MONTH are 500mb. I typically estimate at least 4x space per dl, so 2gb free would do if all at one time.. in general though, I always try to leave 25% of my n onboard hd ##or updates, system cleans, defrags, etc. So 16gb free should cover ANYTHING. These types of pcs aren't meant to be storage devices, rather they are mwant as day to day internet/cloud machines. If you need more space, you'll need an external hd, which are super cheap