https://wccftech.com/windows-10-1903-7gb-reserved-storage/

The next version of Windows 10 is under development as Microsoft continues to test new features and improvements. As reported earlier, the Windows maker is finally paying attention to how Windows updates work. From allowing users to temporarily pause Windows 10 updates to reserving some storage for better management, it seems Microsoft is trying to make the update process more seamless (and possible).

The company has posted a new blog post this week sharing the upcoming feature of “reserved storage.” Microsoft wrote that Windows 10 19H1 (aka April 2019 Update) will set aside some disk space to be used exclusively by updates, apps, temporary files, and system caches.