I recently had to perform a Windows 10 Update (had no choice). After the update I kept on getting this error message:
Low Disk Space
You are running out of disk space on Local Disk (D:).
Click here to see if you can free space on this drive.

This new drive didn’t exist before the update and it appears to be an OEM Partition and it’s been assigned a drive letter.
The popup message was really getting annoying and it would appear every time I restarted the laptop. Apparently, there was a way to hack the registry to disable this popup message but I didn’t want to do this as I actually wanted to be notified when my C: was running out of disk space.
I tried going into Disk Management to remove the drive letter but there was no option to do this when I right clicked. See below:

THE FIX
I had to use the command tool called Diskpart. You need to run this tool in the command prompt as an administrator. Just follow the below steps or watch the video.
In the search type:
cmd
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Right click and select Run as Administrator

type:
diskpart

type
list volume

Check the volume number of the disk drive letter you want to remove

type:
select volume [number]

type:
remove letter [drive]

Now the popup message no longer appears!!! Hope this has helped some of you.
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