Sometimes when you plug in a USD drive, it shows EFI and FAT32/NTFS partition at the same time. It’s odd that if your USB is in this state, it’s better to correct the format before using it for data transfer as people might get confused by all the two new partitions shown up on their PC.
But Windows’ Disk Management doesn’t allow you to remove this partition. When going to Disk Management, right-clicking on the problematic USB drive, you will find out that all options are grayed out. You can’t Delete Volume, nor Shrink Volume nor Extend Volume to merge with other partitions.
That’s OK. There is still another way around, command line diskpart to the rescue.
Launch Command Prompt as Administrator > type
Next, you want to list all the disks connected to your PC by type the below command within diskpart
It shows all the disks currently on your system. Find the USB drive and select the disk by
select disk x(# of disk)
Here is my USB drive showing as Disk 2, so for me, I enter “select disk 2“, yours might be different.
To wipe your disk completely clean. It’s ok if sometimes DiskPart report encountered an error: The system cannot find the file specified. See the System Event Log for more information.
As long as the Disk Management showing all unallocated data for the USB drive you have successfully wiped out the USB drive. It’s time to ready to reformat correctly this time.
Depending on the need of your USB, FAT32 is a common universal format that is suitable for storing files across OS platforms.
That’s it. Now your USB will no longer show two partitions when plugging into a PC. You have successfully removed the EFI partition.
Co-founder of Next of Windows and a cool geek 🙂
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Last updated: 10/11/2016