zellchuck,

If this started after the latest Windows 10 update then follow the steps below to resolve it. If not disregard the information.

All you need to do is remove the drive letter from that partition.  Open a command prompt window as admin and do the following:

Type diskpart hit enter
Type list volume hit enter
make note of the drive that is getting full error
select volume
Type remove letter=
Type exit

Jesse, any way you can help me out with this? I am having a similar but different issue.

Today, I went to install another game and realized that my C drive (500 GB SSD) was getting closer to full, so I went push games to my D drive (1TB) and to my surprise, my D drive displays as nearly full (195 GB remaining with 804 GB used)  but there is nothing in it except a "windowsimagebackup", a file named "DESKTOP-9s...." and a "MedialD.bin file, all of them appear to have nothing more than 1KB data. 

So, in this situation removing the drive letter simply makes the drive unavailable to me. I'm sure it is not full from my use. Would it be safe to reformat and see what happens? or is there another way. 

Aurora R7 - Windows 10 Pro

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@Texas Gamer wrote:

 I am having a ... different issue. Aurora R7 - Windows 10 Pro

 

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Yes, sounds different. The issue Jesse was helping with is specific ... when a Drive-Letter gets assigned to Hidden Partition (usually a Recovery Partition).

I suggest you start your own thread. I also suggest you find-out what is taking-up the 804gb space on your 1000gb HDD. 

Reformatting kills your windows installation. This is the Recovery Drive.