How to Restore Deleted EFI Partition in Windows 10 Simply

The issue: Accidentally deleted EFI partition

Such experience is annoying! Then how to rebuild EFI partition in Windows 10? Please read on.

Restore accidentally deleted EFI partition in Windows 10 using CMD

When the EFI partition is deleted, you can try to recover EFI partition in Windows 10 by recreating it in Command Prompt. Here are detailed steps:

1. Boot your computer using the Windows 10 installation media or Windows 10 recovery disk. On the first screen, press SHIFT+F10 to enter Command Prompt.

2. Run the commands below to shrink a partition for unallocated space:

• diskpart

• list disk

• select disk # ( Select the disk where you want to add the EFI system partition.)

• list partition

• select partition # (Select the partition which you plan to shrink.)

• shrink desired=100 (Shrink the selected partition by 100MB.)

3. Run the following commands to create the EFI system partition with the unallocated space:

• create partition efi size=100

• format quick fs=fat32

• assign letter=S (You may replace “S” with other letters which are not already used.)

• exit

4. Use the command below to copy the boot files from the Windows partition to the EFI system partition and create the BCD store in it:

• bcdboot C:\windows /s S: (“C” is the drive letter of the system partition and “S” is the drive letter you assign to the EFI partition.)

• exit

5. Restart your computer.

In addition to recreating the EFI system partition when there is no EFI partition in Windows 10, you can also realize partition recovery with the help of a professional tool.

More secure way to restore EFI partition in Windows 10

It is better safe than sorry. If you have a good habit of regular backup, you won’t be worried about partition missing anymore. AOMEI Backupper Professional, an all-around Windows PC backup software, provides you with comprehensive data protection.

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Preparations

To restore EFI partition in Windows 10 via AOMEI Backupper, you should do following preparations:

▶ Do "System Backup" instead of "Partition Backup" to backup data on the EFI system partition, thus ensuring the system is bootable after recovery. 
▶ Create bootable media with AOMEI Backupper. It will help you boot your computer in case of boot failure. 

How to recover EFI partition via AOMEI Backupper

Step 1. Connect the bootable drive to your computer and boot from it by changing boot order in BIOS.

Step 2. You’ll see loaded AOMEI Backupper once login. Click “Restore” on the left pane and choose “Select Task”.

Step 3. Select the system backup task and click "Next". If you have created several system backups, you may choose one according to the date. Select a date when the computer was functioning normally.

Step 4. Select to restore entire backup or a part and click "Next".

✍ Tips: The program automatically selects the current system partition (usually C drive) as destination drive. You can also change the default destination drive by ticking “Restore system to other location” in the bottom.

Step 5. Confirm operations on the “Operation Summary” page and click on “Start Restore” button.

Step 6. Restart your computer to boot from the original hard drive. Safely disconnect the bootable drive and keep it properly for future use.

What is EFI partition?

EFI partition, or EFI system partition (ESP), is a partition used by computers adhering to the Unified Extensible Firmware Interface (UEFI). When a computer is booted, UEFI firmware loads files stored on the ESP to start installing the operating system and various programs.

What will happen if EFI partition is missing?

If the EFI partition is missing from a system, several critical issues may occur, particularly on systems using the Unified Extensible Firmware Interface (UEFI) for booting. Here's what could happen:

🙁 Inability to Boot the OS

The EFI System Partition (ESP) contains the bootloader and necessary files that are used to start the operating system. Without it, the system cannot find the boot files, leading to boot failure. This will typically result in a “No Boot Device Found” error or a message like "Operating System Not Found."

🙁 Loss of Boot Options

Without the EFI partition, UEFI cannot load the boot configuration data (BCD). This means even if you have an operating system installed, you won’t be able to select it during startup.

🙁 Problems with Multi-Boot Systems

If you're running a multi-boot setup with multiple operating systems (like Windows and Linux), the missing EFI partition will prevent UEFI from recognizing and managing the different bootloaders, leading to failure to access all OSs.

🙁 Recovery Environment May Not Work

Some recovery or system restore environments also rely on files stored in the EFI partition. Without it, you may not be able to access recovery tools or repair the bootloader.

If you encounter these errors, follow the steps above to recreate EFI partition.

Summary

If you lose the EFI partition by accident, you can restore EFI partition in Windows 10 by recreating it in Command Prompt or get it back with the help of a specialized tool. You may adopt the same methods to restore EFI partition in Windows 7.

For better data protection, you can do regular backups for the system/disk/partition/file via AOMEI Backupper. Additionally, AOMEI Backupper allows you to clone C drive to larger SSD and sync folders in real time. Get this tool and enjoy all the wonderful features right now!

If you want to protect unlimited computers within your company, you can pick AOMEI Backupper Technician. With the inbuilt AOMEI Image Deploy tool, you are also allowed to deploy/restore system image file on server-side computer to multiple client-side computers over network.