Few days back, Microsoft officially rolled out Windows 10 V1803 aka April 2018 Update. See this post, if you can’t get this update on your Windows 10 device. However, after upgrading to V1803, some users have commonly reported a bug which we will discuss in this article.
Actually, after upgrade, users may found an extra disk partition that is visible in File Explorer, under This PC. This partition is created just after V1803 update is installed. The partition is also visible in Disk Management and DISKPART.
After researching a bit on this, we found that the newly introduced partition is actually the recovery partition. As we all know that recovery partition is hidden by default. But V1803 update may have assigned a drive letter to this partition and thus it become visible in File Explorer and other disk related snap-ins. This problem may be faced by the users who upgraded, rather than making clean install of V1803.
Recommended: Understanding different disk partitions in Windows 10.
There is no need to worry about new partition but if its annoying to you, remove its drive letter and it will become hidden again. It is advisable that you should not delete this extra partition or modify it, otherwise it may affect your system.
Below mentioned steps will show you how to remove the drive letter from this partition.
FIX: Windows 10 April 2018 Update Creates Extra Disk Partition
1. Right click on Start Button and select Command Prompt (Admin).
2. In the Command Prompt window, type the commands mentioned in bold one-by-one and press Enter key after each:
select volume # Replace # with the newly appeared partition number
remove letter="X" Replace X with the newly appeared partition drive letter
3. Close Command Prompt and reboot your machine. After restarting your system, the extra disk partition will no longer visible.
Hope this helps!