Remove low storage message after Windows update

After the Windows 10 version 1903 update I got with regular intervals a message indicating that there was low storage on local disk W . According to a link on the internet (my case being drive letter W and not F) this was caused by the following

That is a System partition that has been mistakenly given a drive letter.
That partition was always there, and it needs to be there.
It just does not need a drive letter F.

The same link pointed to an article with instructions to Remove a drive letter:

• open a Command Prompt with administrators rights. In my case the easiest way to do this, is right-clicking on start and chosing Command Prompt (Admin)
• open the partition manager of Windows by typing 'diskpart'
• in this application list the volume (numbers) on your system and their associated drive letters by typing 'list volume'
• select the volume from which you want to remove the drive letter. In my case the number 4 corresponded with drive letter W and therefore I typed 'select volume=4'
• then I remove the drive letter W by typing 'remove letter=W'.
• exit the diskpart application by typing 'exit' and once again 'exit'

No more low storage messages after this.