This Tweak will disable the low disk space messages.

To disable this, follow the next steps:

1. Open the Registry Editor click on the Start button on your taskbar, then click on Run and type "regedit" and click on OK to start the regedit utility.
    
2. Expand HKEY_CURRENT_USER\Software\Microsoft\Windows\CurrentVersion\Policies\Explorer\ (see picture 1).
   
   

   Picture 1

3. If not already there create a new DWORD value "NoLowDiskSpaceChecks" and change the value to "1".
    
4. The modifications you made will be in effect after you reboot your PC.