By Ivy / Last Updated September 9, 2019

What is boot partition in Windows?

In the Windows operating system, a boot partition is a primary partition which contains the boot loader and can help you boot the installed operating system. In general, there are two common boot partitions in Windows, including EFI system partition and system reserved partition. And you can only see it when you use Disk Management or similar tools.

EFI system partition (ESP) is a partition on a hard drive or solid-state drive of the (Unified Extensible Firmware Interface) UEFI-based computer and this partition contains bootloader, device driver files which will be used by firmware at boot time.

System reserved partition is a hidden partition on the BIOS-based computer and it consists of two parts, including the Boot Manager and Boot Configuration Data (BCD), the startup files used for BitLocker drive encryption.

Can you delete boot partition in Windows 10?

Whether EFI system partition or system reserved partition can help you boot the installed operating system. Both contain boot files which will be used by firmware at the boot time. Once the partition gets lost or the boot files are missing or corrupted, your computer will be unbootable.

In summary, it’s not wise for you to delete boot partition on the computer. You cannot use a computer without boot partition to do anything.

Accidentally deleted boot partition in Windows 10 – how to recover?

As mentioned above, the boot partition is very important and it can help you to boot the Window. Without boot partition, there is no meaning for the computer.

However, you may delete boot partition by mistake. And then you must want to know how to recover deleted hard drive partition. See below and learn how to recover it?

Recover deleted partition in Windows 10 with third party software

In this part, I’ll tell you a partition recovery software AOMEI Partition Assistant . With the help of it, you can recover deleted partition in Windows 10 without any obstacle. Also, you can recover lost partition in Windows 10.

Besides, AOMEI Partition Assistant is still a partition manager. You can use it to do more things, such as, resize system partition, move unallocated space to the left or right side, remove write protection form hard drive, etc.

Make bootable disk in a working computer

Step 1. Install AOMEI Partition Assistant on a working computer, launch it. Click Make Bootable Media and next at the left panel.

Make Bootable Media

Step 2. Tick USB Boot Device in the following window and click Proceed to start the pending operation.

Choose Usb Drive

Recover accidentally deleted partition in Windows 10

Step 1. Connect the bootable drive to the computer having problem and boot from it. You may need to change boot order in BIOS first. And then, the main page of AOMEI Partition Assistant will appear and click Partition Recovery Wizard on the left panel.

Partition Recovery Wizard

Step 2. Select the disk which contains deleted boot partition.

Select Disk

Step 3. Select Fast Search at the first time and click Next. This method takes less time. If you cannot find the deleted partition, you can select Full Search later.

Search Methods

Step 4. Select the deleted boot partition in the following list and click Proceed. For security, you can click Explore files in the selected partition and view files to confirm.


How to recover deleted partition using CMD?

In view of the difference to recover deleted EFI system partition and system reserved partition, I will tell you how to recover deleted partition separately.

Before recovering partition, you need to download media creation tool from Microsoft and follow the instructions and details to create an installation disk for your computer.

How to recover accidentally deleted EFI system partition in Windows?

Step 1. Insert the installation disk into your computer and boot from it.

Step 2. In the first screen, press Shift + F10 to summon the Command Prompt.

Step 3. Type the following commands and hit Enter after each one.

  • diskpart

  • list disk

  • select disk n (n refers to the disk which contains the deleted the EFI System partition.)

  • list partition

  • create partition efi

  • format quick fs=fat32

  • list partition

Create EFI Boot Partition 1

  • list volume (find the volume letter which belongs to the installed Windows OS.)

  • exit (exit diskpart)

  • bcdboot m:\windows (m refers to the volume letter of installed Windows OS.)

Create EFI Boot Partition 2

Note: bcdboot m:\windows command will copy the boot files from Windows partition to the EFI system partition and create BCD store in the partition.

Step 4. Remove installation drive and restart your computer

How to recover accidentally deleted system reserved partition in Windows?

Step 1. Boot from installation drive and summon the command prompt using Shift + F10.

Step 2.Type the following commands in the command prompt and hit Enter.

  • bootrec /fixmbr

  • diskpart

  • select disk 0

  • list partition

  • select partition n (n is the Windows OS partition)

  • active

  • exit (exit diskpart)

  • bootrec /fixboot

  • bootrec /rebuildbcd

Accidentally Deleted System Reserved Partition 1

And then, you can boot from the repaired drive. If you receive an error message like bootmgr is missing, you need to copy the bootmgr file from Windows installation drive to Windows OS partition root directory.

Step 3.Type the following commands in order and hit Enter.

  • diskpart

  • list volume (find and remember the volume letter of DVD-ROM)

  • exit (exit diskpart)

Step 4.Copy bootmgr file to Windows OS partition root directory. You can type the following command and hit Enter.
copy n:\bootmgr C:\ (n: refers to the volume letter of DVD-ROM)

Accidentally Deleted System Reserved Partition 2

Fix deleted partition now wont boot by reinstalling Windows 10

If you created a Windows 10 recovery disk, you can use it to recover your computer. In addition, you can reinstall Windows 10 from USB drive if you have an installation drive.

Before reinstalling, you need to connect USB flash drive to your computer, set boot priority to USB flash drive via BIOS, and then restart your computer and press any key to boot from USB flash drive.

Reinstall your computer with detailed steps.

Step 1. Wait for Windows 10 installation files to load.

Step 2. Set up language and other preference, then click Next and Install now.

Step 3. Click I don't have a product key and Next. The product key will reactivate itself after reinstallation if it was activated on your computer.

Step 4. Select the operating system and click Next.

Step 5. Accept the license terms and click Next.

Step 6. Select Windows 10 installation type: Custom.

Custom Install

Step 7. Click Drive Options and you will see some options (eg: Delete, Format, Extend) at the bottom.

Step 8. Right-click the system partition and the operating systems related partition, click Delete.

Step 9. Select the unallocated space and click Next to install your Windows

Wrapping things up

To recover accidentally deleted boot partition in Windows 10, you can use free partition recovery software AOMEI Partition Assistant. It’s very easy to use, even for a beginner. You just need a working computer and follow the instructions on the screen.

In addition, you can use CMD to recover deleted partition in Windows 10. It’s very useful. But if you are not familiar with it, you’d better use free partition manager. In AOMEI Partition Assistant, all the steps are fixed and there is a little chance to make mistake.

Reinstalling Windows 10 from USB drive can also be a great choice if you have a recovery disk or an installation media. The limitation is that you need to reinstall all your apps again and you will lose your files.

So, choose the one that is suitable for you.