Windows 10: SYSTEM is the EFI partition and how do I remove the drive letter and make it inaccessible?

submitted by /u/Madesh1326
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:)

 

Drive letter for EFI system partition?

The only risk is that it will give the user and programs access to the EFI System Partition through the drive letter to make changes. I doubt that assigning a drive letter will fix the issue because we do backups all the time with no drive letter assigned to the EFI System Partition, but you can try, and just remove the drive letter after the backup is done.

The good news is that it is extremely easy to rebuild the EFI System Partition.

 

Drive letter for EFI system partition?

In Macrium Reflect (free), a Dell Optiplex 3046 running 6.3.1835 on Win 10 64 Pro, returns a

when performing a backup that includes the EFI system partition. Macrium's suggested solution is to assign a drive letter to that partition. The EFI partition is required for a disk image.

Before I assign a drive letter I'd like to understand what risks there are in the assignment.

 

Drive letter for EFI system partition?

It's pretty easy to rebuild the EFI System Partition. You just have delete the corrupt one. Create a primary partition where it used to be, format it as FAT32, assign it a drive letter. Run the command:

bcdboot C:\Windows /s F: /f UEFI

Make sure the drive letter in Red is the drive letter currently assigned to the Windows partition, and the orange drive letter is the letter assigned to the new EFI System partition.

Then remove the drive letter from the EFI Partition and change the partition ID to: c12a7328-f81f-11d2-ba4b-00a0c93ec93b

All of that can be done in an admin Command Prompt with diskpart commands (and exit diskpart to run bcdboot command).

If you know what you are doing, takes less than 2 minutes to accomplish.