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Accidentally deleted the boot partition in Windows 10

What is the boot partition in Windows 10/8/7?

In the Windows operating system, the boot partition is the main partition containing the loader, which can help you start the installed operating system. Generally, there are two common boot partitions in Windows, including EFI system partition and system reserved partition. And it can only be seen when using Disk Management or similar tools.

The EFI system partition (ESP) is a partition on the hard disk or solid-state drive of a computer based on the UEFI (Unified Extensible Firmware Interface) system. The partition contains the boot loader boot and the device driver firmware. Files used at boot time.

The system reserved partition is a hidden partition on a BIOS-based computer. It consists of two parts, including the boot manager and the boot configuration data (BCD), which is used to encrypt the boot files of the BitLocker drive.

Can I delete the boot partition in Windows 10?
Whether the EFI system partition or system reserved partition can help you boot the installed operating system. Both contain the boot files used by the firmware when Windows starts. Once you accidentally delete the boot partition in Windows 10 or the boot file is missing/corrupted, your computer will not start. In short, it is not recommended that you delete the boot partition on your computer.

I accidentally deleted the boot partition in Windows 10, how do I get it back?
As mentioned above, the boot partition is very important and can help you start the window. Without a boot partition, it is meaningless to the computer. However, you may delete the Windows boot partition by mistake. Then you must be wondering how to recover deleted boot partition on Windows 10/8/7. See below and learn how to restore it in three different ways.

Method 1. Use third-party software to recover deleted boot partition in Windows 10
This section introduces a professional partition recovery software from AOMEI Partition Assistant. With it, you can easily restore deleted Windows partitions, as long as you do not perform any operations on the boot partition after deletion. In addition, you can use it to recover lost partitions on Windows 10/8/7 (all versions).
In addition, AOMEI Partition Assistant is still a multi-functional partition manager. You can use it to do more things, such as resizing the system partition, moving unallocated space to the left or right, expanding the NTFS system drive without restarting, removing the hard drive write protection, etc.

Step 1. Create a boot disk on another working computer
First, we need to create a boot disk on another running Windows computer because the system partition The computer was accidentally deleted and cannot start now.
1.1. Connect an empty USB drive to a working Windows computer, and install and start AOMEI Partition Assistant Professional on this PC. Click "Create Boot Device" on the left panel, and then click "Next" on the next screen.
1.2. Select "USB Bootable Device" in the next window, and then click "Continue" to start the suspended operation.
Step 2. Restore deleted Windows partitions in WinPE mode
After booting the U disk and creating it successfully (pre-installed AOMEI Partition Assistant Professional Edition), you can insert and enter A Windows computer that cannot be started with the deleted system partition. Restart, keep pressing F1, F2, F12 or other function keys to enter the BIOS. You need to change the startup sequence to start the computer from the target startup disk.
After logging in, you will see AOMEI Partition Assistant Professional Edition is running. Then do the following:
2.1. Click "Partition Recovery Wizard" in the left pane.
2.2. Select the disk containing the deleted boot partition.
2.3. Select "Quick Search" for 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 from the list below, and then click "Continue". For safety, you can click "Browse files on selected partition" and view the files for confirmation.

Method 2: Restore the deleted boot partition without using CMD
The difference between restoring the deleted EFI system partition and the system reservation Partition, I will tell you separately how to recover the deleted partition. Before recovering the partition, you need to download the Microsoft Media Creation Tool and follow the instructions and detailed information to create an installation disc for your computer.
Part 1. Recover accidentally deleted EFI system partition in Windows 10
1.1. Insert the installation CD into your computer and boot from it.
1.2. On the first screen, press "Shift + F10" to invoke the command prompt.
1.3. Type the following commands and press "Enter" after each command.
& nbsp; * diskpart
& nbsp; * Disk list
* Select disk n (n refers to the disk containing the deleted EFI system partition) .
* Partition list
* Create efi partition
* Quick format fs = fat32
  * Partition list
  * List volumes (find the letters of the volumes belonging to the installed Windows operating system).
& nbsp; * Exit (exit diskpart)
  * bcdboot m:\windows (m refers to the volume number of the installed Windows operating system.)
Note: The command "bcdboot m:\windows" will copy the boot files in the Windows partition to the EFI system partition and create BCD storage on the partition.
1. 4. Remove the installation drive and restart the computer

Part 2. Recover the accidentally deleted system reserved partition in Windows 10
2.1. Boot from the installation drive and use "Shift + F10" to call the command prompt.
2. 2. Type the following command at the command prompt and press "Enter".
* bootrec / fixmbr
* diskpart
* select disk 0
* Partition list
*Select partition n (n is the Windows operating system partition)
* Activities
* exit (exit diskpart)
* bootrec / fixboot
* bootrec /rebuildbcd
Then you can boot from the repaired drive. If you receive an error message such as bootmgr is missing, you must copy the bootmgr file from the Windows installation drive to the root directory of the Windows operating system partition.
2.3. Type the following commands in order, and then press "Enter".
& nbsp; * diskpart
& nbsp; * volume list (find and remember the volume number of the DVD-ROM)
  * exit (exit diskpart)
2.4. Copy the bootmgr file to the root directory of the Windows operating system partition. You can type the following command and press Enter.
copy n:\bootmgr C:\(n: refers to the volume number of the DVD-ROM)

Method 3. Repair the deleted partition that can’t start now by reinstalling Windows 10
If you created a Windows 10 recovery disc, you can use it to recover your computer. Also, if you have an installation drive, you can reinstall Windows 10 from the USB drive.
Before reinstalling, you need to connect the USB flash drive to the computer, set the boot priority to the USB flash drive through the BIOS, and then restart the computer and press any key to boot from the USB flash drive.
Follow the detailed steps to reinstall your computer.

3.1. Wait for the Windows 10 installation file to load.
3.2. Set the language and other preferences, and then click "Next" and "Install Now".
3.3. Click I do not have a product key, and then click Next. If the product key is already activated on your computer, the product key will be reactivated after reinstallation.
3.4. Select the operating system, and then click "Next".
3.5. Accept the license terms and click "Next".
3.6. Choose Windows 10 installation type: Custom.
3.7. Click the drive option, you will see some options at the bottom (for example: delete, format, expand).
3.8. Right-click the system partition and the partition related to the operating system, and click "Delete".
3.9. Select unallocated space and click Next to install your Windows

To restore accidentally deleted startup in Windows 10 To partition, you can use the recovery software AOMEI Partition Assistant. It is very easy to use, even for beginners. All you need is a working computer and follow the instructions on the screen.

In addition, you can also use CMD to recover deleted Windows partitions in Windows 10 for free. It is very useful, but it is a bit complicated to operate. All in all, it is best to use a professional partition manager. In AOMEI Partition Assistant, all steps are fixed and there is little possibility of error.
If you have a recovery disc or installation media, reinstalling Windows 10 from a USB drive is also a good choice. The limitation is that you have to reinstall all applications again and you will lose files.
So choose the one that suits you.


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