Through reserved storage, some disk space will be set aside to be used by updates, apps, temporary files, and system caches. Starting with the next major update we’re making a few changes to how Windows 10 manages disk space. Windows Insiders: To enable this new feature now, please see the last section 'Testing out Storage Reserve' and complete the quest Reserving disk space to keep Windows 10 up to date First published on TECHNET on Jan 07, 2019