To resolve this error, the EFI partition needs to be fixed. Follow the steps below:

1. Mount the EFI partition using the command below:

   mountvol b: /s

    

   Make sure that the mounted partition is the correct one. When the disk is connected to a different machine, you may need to use diskpart to mount the EFI partition.

   If the mountvol command does not work, use the diskpart command. Below is an example:

   diskpart 
     list disk 
     select disk # Note: select the target disk 
     list partition 
     select partition # Note: Select the EFI System partition. 
     assign letter=b 
     list volume 
     exit      

   

    

   The File System (Fs) may display RAW if the partition became corrupted.
2. Use chkdsk to fix the partition. Follow these steps:
   1. Make sure that chkdsk still detects the file system of the partition:

      

   2. Fix the partition using the command below:
      Chkdsk /F b:
   3. Unmount the partition by using this command:
      mountvol b: /d

      If the mountvol command does not work, use the diskpart command. Below is an example:

      diskpart 
        remove letter=b 
        list volume 
        exit