When you install Windows 11 or 10 on your PC’s boot drive, the process automatically creates a partition called the EFI system partition, which stores some critical files that the computer needs to read on startup. The EFI system partition doesn’t take up much space, typically only using a few hundred megabytes (mine was 100MB at the time of writing). Because this partition is required to boot, Windows, by default, does not allow you to delete it.
However, if you take an SSD or HDD that was once a boot drive and want to completely reformat it to use as a data drive, you might want to get rid of the EFI system partition so you have one big partition for all your files. Using the simple instructions below, you can delete the EFI system partition in Windows 10 or 11. Just make sure you don’t do this on your boot drive or you won’t be able to boot!
How to Delete EFI System Partition in Windows
1. Launch Diskpart.
2. Walk in list disk to see a list of all connected drives. The drive number of the drive you want to delete must be the same as the one that appears in the Disk Manager application.
3. Walk in set disk [Disk Number] or [Disk Number] is the number of the drive from which you want to delete.
4. Walk in list partitions.
5. Walk in salt partition [PARTITION NUMBER] to choose the reserved partition you want to delete.
6. Walk in delete partition replacement.
At this point, the EFI system partition should be deleted. However, you need to confirm by looking at the disk in the Windows Disk Management app (load it by searching for “disk management”). If it still appears, reboot and check again.