As you may have noticed by now the Hardrive is safely tucked away inside the Xbox One, and you have also probably noticed how you can tell how much room you have left right? The simple answer is , you cant. This is just one of the features I feel is missing from the Xbox One right now, asides being able to add friends easily, and a task manager. You will know when you're 500GB HDD is almost full though becuase you will be greeted with a message like this: So the solution to lack of space on the Xbox One is just to delete other apps. I really hope there is a better solution than this in a future update, because 500GB isn't going to last all that long.