Windows 10 1803 new OEM (or ESP) Partition

So Windows 10 1803 update creates another OEM partition. In my case, the new partition decided to take over one of my existing drive letters, G: that was mapped to a shared network location. This was confusing, because my G drive (4TB) suddenly became empty.

Disk Management revealed  what the culprit was. The All New OEM partition 450 MB in size, NTFS file format, allegedly. At this stage, I was not interested what this partition does, but what is the point of it in the first place if it’s empty. All I wanted was to get my real G drive back.

What we want to do now, is to remove the letter G from the partition. In order to do this, click Start button and type CMD, then right click on it and click Run as administrator

In CMD, type:  DISKPART

In Diskpart, type:  list volume

Then:  select volume 3 In my case, the drive I’m interested in is a Volume 3 – G drive.

And now:  remove letter=g

The letter G has now been removed from the OEM partition. I was now able to map my network drive to letter G again.