Block file downloads when users are low on disk space
This setting lets you specify a minimum amount of available disk space and block the OneDrive sync app (OneDrive.exe) from downloading files when users have less than this amount.
Users will be prompted with options to help free up space.
Enabling this policy sets the following registry key value to a number from 0 through 10240000. [HKLM\SOFTWARE\Policies\Microsoft\OneDrive]" MinDiskSpaceLimitInMB