7

There are these similar questions like mine already: How do I mount the EFI partition on Windows 8.1 so that it is readable and writeable?

But, my trouble is that these methods are not working for mounting an EFI partition located on a flash drive on my Windows 10 (Version: 1709, Build: 16299.309) PC.

Following is a screenshot of the message I get in a command prompt using the diskpart utility:

command prompt window running diskpart

What would be a workaround here?

Scott - Слава Україні
  • 22,532
Subho
  • 171

2 Answers2

5

I found a way for it to work using mountvol by issuing mountvol /? first.

The output will have some hint at the end and in my case it was:

Possible values for VolumeName along with current mount points are:

\\?\Volume{38d5d60e-5760-43bc-85ac-25f3452b2e2f}\
    *** NO MOUNT POINTS ***

\\?\Volume{5f7cfdd0-dc43-0c6f-e24a-85ed1e43d782}\
    E:\

\\?\Volume{b08ddf00-9937-413c-82e9-c0e55525e46f}\
    *** NO MOUNT POINTS ***

\\?\Volume{07434f9f-e9d4-11e9-84c3-7085c2c582c4}\
    *** NO MOUNT POINTS ***

\\?\Volume{07434fa0-e9d4-11e9-84c3-7085c2c582c4}\
    D:\

\\?\Volume{45ce4d69-be26-4a9e-bc11-d850c69875ec}\
    C:\

After some tries (you can test one by one), the command that worked for me is:

mountvol h: \\?\Volume{07434f9f-e9d4-11e9-84c3-7085c2c582c4}\

Then find a way to access H:, which shows up: open Task Manager > File > Run New Task, and browse to it.

JW0914
  • 9,096
Lan Nguyen
  • 161
3

You can do it easily using Windows PowerShell without using any third-party apps.

Lets assume disk number is 4 and EFI partition number is 1.

  1. Open PowerShell with Admin privileges.

  2. Use the following syntax with a respectable drive letter and a partition number.

    Add-PartitionAccessPath -DiskNumber 4 -PartitionNumber 1 -AccessPath "Z:"

This will mount the EFI volume "Z". (you can't access the volume using windows explorer without Admin privileges , So use third-party apps like 7Zip File manager(run as Administrator) etc..)

Lalith J.
  • 169