What is boot partition in Windows 10/8/7?
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 Windows startup time. Once you accidentally deleted the boot partition in Windows 10 or the boot files are missing/corrupted, your computer will be unbootable. In summary, it’s not wise for you to delete boot partition on the computer.
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 Windows boot partition by mistake. And then you must want to know how to recover deleted boot partition in Windows 10/8/7. See below and learn how to recover it via three different methods.
Method 1. Restore deleted boot partition in Windows 10 with third party software
In this part, I’ll tell you a piece of partition recovery software AOMEI Partition Assistant Professional. With it, you can easily recover deleted Windows partition as long as you won’t make any further operation on the boot partition after deletion. Also, you can use it to recover lost partition in Windows 10/8/7 (all editions).
Besides, AOMEI Partition Assistant is still a versatile partition manager. You can use it to do more things, such as, resize system partition, move unallocated space to the left or right side, extend NTFS system drive without reboot, remove write protection form hard drive, etc.
You can download its free Demo version first and follow the steps below:
Step 1. Make a bootable disk in another working computer
First of all, we need to make a bootable disk on another working Windows computer because the computer whose system partition is deleted by accident cannot boot now.
1.1. Connect an empty USB drive to the working Windows computer, install and launch AOMEI Partition Assistant Professional on this PC as well. Click “Make Bootable Media” at the left panel and “Next” on the next screen.
1.2. Tick “USB Boot Device” in the following window and click “Proceed” to start the pending operation.
Step 2. Recover deleted Windows partition in WinPE mode
After the bootable USB drive is created successfully (the AOMEI Partition Assistant Professional is pre-installed in it), you can insert it into the Windows computer which cannot boot with system partition deleted. Restart it and constantly press F1, F2, F12 or other function keys to enter BIOS where you need to change the boot order to boot computer from the destination bootable drive.
When you log in, you will see the AOMEI Partition Assistant Professional is running. Then do as below:
2.1. Click ”Partition Recovery Wizard” on the left panel.
2.2. Select the disk which contains deleted boot partition.
2.3. 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.
2.4. 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.
Method 2. Recover deleted boot partition free 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.
Part 1. recover accidentally deleted EFI system partition in Windows 10
1.1. Insert the installation disk into your computer and boot from it.
1.2. In the first screen, press “Shift + F10” to summon the Command Prompt.
1.3. Type the following commands and hit “Enter” after each one.
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.
2. 4. Remove installation drive and restart your computer
Part 2. Recover accidentally deleted system reserved partition in Windows 10
2.1. Boot from installation drive and summon the command prompt using “Shift + F10”.
2. 2.Type the following commands in the command prompt and hit “Enter”.
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.
2.3. Type the following commands in order and hit “Enter”.
2.4. 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)
Method 3. 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.
3.1. Wait for Windows 10 installation files to load.
3.2. Set up language and other preference, then click "Next" and "Install now".
3.3. 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.
3.4. Select the operating system and click "Next".
3.5. Accept the license terms and click "Next".
3.6. Select Windows 10 installation type: Custom.
3.7. Click Drive Options and you will see some options (eg: Delete, Format, Extend) at the bottom.
3.8. Right-click the system partition and the operating systems related partition, click "Delete".
3.9. 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 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 Windows partition in Windows 10 free. It’s very useful, but kinda of complicated to operate. All in all, t, you’d better use professional 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.