[Fix] EFI System Partition Appears in Explorer

The EFI system partition, which contains your boot files and boot configuration database, is hidden by default. However, on some systems, the EFI partition may show up with a drive letter in File Explorer.

efi system partition drive letter

Even though you remove the drive-letter manually using DiskPart, Windows may automatically assign a drive-letter for the EFI partition at every reboot.


This happens due to an unwanted registry value under the following registry key:


The above registry may have a DosDevices entry (i.e., “DosDevices\G:”, where G is your EFI drive letter) for your EFI system partition. This registry value causes the problem.


To hide the EFI system partition and prevent the automatic drive letter assignment for the partition, follow these steps:

Method 1: Using Diskpart

Open an admin Command Prompt and run the following commands:

Note: In this example, the EFI partition shows up with the drive letter G:. The following commands are based on that scenario. If the EFI appears with a different drive letter on your computer, replace “G” in the following commands with the correct drive-letter.


The above command will start the Diskpart environment.

Run the following commands:

select volume G

remove letter=G


You’re now out of the Diskpart environment.

Method 2: Using the MountVol command

Run these two commands from an admin Command Prompt:

(where G: in this example is the EFI partition. See screenshot at the top of this page.)

mountvol G: /d

mountvol /R

The EFI system partition should no longer show up in Explorer.

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Ramesh Srinivasan is passionate about Microsoft technologies and he has been a consecutive ten-time recipient of the Microsoft Most Valuable Professional award in the Windows Shell/Desktop Experience category, from 2003 to 2012. He loves to troubleshoot and write about Windows. Ramesh founded Winhelponline.com in 2005.

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