I have a very large map with a file size of 2.47gb. Recently whenever I load the map the auto-save icon will come up and if the file size goes past 2.5gb the map will crash with the error "You are out of data storage space and Minecraft is unable to save your progress! Minecraft will return you to the Main Menu to clear up storage space". I currently have over 200gb of space free on my PC and do not believe that I'm too low on space.