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How to Restore Deleted Windows Partition after Windows Can't Boot?

Contents:

Summary: Windows can't boot after accidentally deleting EFI partition or system reserved partition? How to restore deleted Windows partition? Learn this post and you will know a piece of professional partition recovery software is useful to do the Windows partition recovery so that your computer can be bootable properly.

Windows System Partition Is Missing

"I was messing around with partitions and created a test partition that was, unfortunately, the same size as my EFI partition. I went to delete my test partition but deleted the EFI partition by mistake and now my computer won't start. What do I do?"

--from tomshardware

"I only have Windows 7 installed. I accidentally deleted the System Reserved Partition and now I can no longer boot into Windows 7. The installation of Windows and all my files still exist in the partition, but without the System Reserved Partition I can no longer boot. After I deleted the System Reserved Partition I moved left the primary partition to fill the space. Is there any way I can "reinstall" that System Reserved Partition and the boot files?"

--from superuser

The above two examples show you true cases about EIF partition or system reserved partition loss leading to Windows fails to boot. Here we will introduce some information about EFI partition and system reserved partition, and the solutions to restore deleted Windows partition in these two situations in Windows 10/8/7.

Windows Fails to Boot after System Partition Deletion

  • EFI System Partition

    For a system disk with GUID Partition Table, there is an EFI system partition (ESP) which refers to a partition used by computers adhering to the Unified Extensible Firmware Interface (UEFI). When your computer is booted, UEFI firmware loads the files on this ESP partition to start the installed operating system and various utilities. Usually, EFI system partition is formatted with FAT file system. From the definition of ESP partition, you know once EFI system partition is lost, Windows will be unbootable because of the missing boot files.

  • System Reserved Partition

    When installing an operating system such as Windows 10/8/7 to a clean formatted MBR disk, the system reserved partition will be created at the beginning of your hard disk with the active status. This partition contains three important things including the Boot Manager and Boot Configuration Data, and the startup files used for BitLocker drive encryption.

    Once you accidentally delete system reserved partition, Windows will fail to boot due to missing BOOTMGR and BCD. And it is possible that BOOTMGR is missing or operating system not found error message appears.

    So, what should you do to recover deleted Windows system partition? Look at the following content to know the methods for lost system partition recovery in two cases.

How to Restore Deleted Windows Partition

case 1 Case 1: Accidentally Deleted EFI Partition in Windows 10/8/7

From the example in the first part, you know it is a common issue to delete the EFI system partition by mistake. So, is it possible to get back the lost EFI partition? Of course, the answer is positive. Here we will provide you with two effective ways to restore deleted EFI boot partition.

solution 1 Solution 1: Make Windows Partition Recovery with MiniTool Partition Wizard

If you are searching a simple way to get back the deleted EFI system boot partition, you can ask a piece of professional partition recovery software for help. Fortunately, MiniTool Solution Ltd. has developed a very dedicated partition manager named MiniTool Partition Wizard. This partition software can be used to resize/extend partition, migrate OS, clone disk/partition, rebuild MBR, recover lost/deleted partition and so on. Among so many features, here its "Partition Recovery" is available to recover deleted partition in Windows 10/8/7.

tip MiniTool Partition Wizard has six editions including Free, Professional, Pro Ultimate, Server, Enterprise, and Technician. Here in consideration of unbootable operating system, we recommend you to use its Professional Edition or a more advanced edition since it has a feature named "Bootable Media" allows you to create a bootable disc for system startup.

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Here is the guidance about how to restore deleted Windows EFI partition:

attention Attention:

After booting your Windows 10/8/7 from the bootable CD/DVD or USB flash drive you have made, you will enter the main interface of MiniTool Partition Wizard.

Here you will see that the EFI system partition in original becomes unallocated space and there is a 128MB partition immediately following this unallocated space. Before you start to restore deleted Windows partition, please delete the 128MB partition firstly, which won't have any influence on system startup. Why? MiniTool Partition Wizard can't recover the lost/deleted partition with an unrecognized file system and here the 128 partition shows "other" file system.

Just select the other partition, click "Delete Partition" feature or right click the target drive to select "Delete". And then click "Apply" button to execute this deletion.

delete other partition

Step 1: After deleting the other partition in Windows 10/8/7, it is time to solve accidentally deleted EFI partition issue by Windows partition recovery operation. Right click on the GPT disk with the system to select "Partition Recovery" feature or select the target hard disk and click this feature from "Check Disk" menu.

restore deleted windows partition

Step 2: Then you will enter an interface where you need to select a scanning range. From the figure as follows, three options are listed, including "Full disk", "Unallocated Space", "Specified Range". Just select an applicable range according to your needs. The first option is checked by default. Then click "Next" button to continue.

scanning range

Step 3: Next choose a proper scanning method. Here "Quick Scan" and "Full Scan" scanning methods are provided by MiniTool Partition Wizard. The former is designed to restore deleted Windows partitions which are continuous and the latter is suitable when "Quick Scan" cannot find lost EFI system partition since it adopts the method of scanning every sector of the selected scanning range.

scan method

Step 4: Then the scanning process will take a few seconds. Next, all partitions including lost/deleted and existing partitions will be listed. Please choose all those partitions (both existing and lost). After checking partitions, in the "Preview", you can see the accidentally deleted EFI partition is shown. Please click "Finish" to go back to the main interface.

choose found partitions

Step 5: Click "Apply" to execute the partition recovery operation.

apply

Note: After partition recovery, the recovered lost EFI partition doesn't have a drive letter. Here it is not necessary to allocate a letter for the recovered EFI partition. But if you need to recover data partition, it is essential. Otherwise, the partition won't show up in Windows Explorer.

Then after finishing the EFI partition recovery for system boot, please change the boot order in BIOS to boot from your hard disk. And then, Windows will run normally. With the help of MiniTool Partition Wizard Professional Edition, you can easily solve accidentally deleted EFI system partition issue by creating a bootable disc via "Bootable Media" and recovering deleted Windows system partition via its "Partition Recovery" feature. Just get MiniTool Partition Wizard Professional Edition via the following button now.

solution 2 Solution 2: Create EFI Partition Diskpart

In addition to the above method, when searching the solution online, you will find some forum users suggest creating EFI partition via diskpart to ensure your Windows 10/8/7 can boot properly. How to create an EFI partition? Please prepare a Windows installation and press "Shift +F10" on the first screen to use Command Prompt.

Tip:

There are three different options when creating EFI partition:
1. have the unallocated space available for the EFI System partition and no other unallocated space on the drive
2. have the unallocated space available for the EFI System partition
3. do not have the unallocated space available for the EFI System partition

According to different situations, the commands are different. Here from the above disk layout of MiniTool Partition Wizard, it belongs to the second situation. So, we take this situation as an example.

After running Command Prompt, please type the following commands in turn:

diskpart
list disk
select disk n: n means the number of the disk where you want to add the EFI System partition.
list partition
create partition efi size=100
format quick fs=fat32
list partition
list volume n: n refers to the volume letter where the Windows OS is installed.
exit
bcdboot X:\windows: replace X with the partition letter of the Windows OS partition.(Here the letter is C)

Then BCDBOOT will copy boot files to the EFI system partition from Windows partition and create the BCD to save it to the same partition.

Note:
  • For Advanced Format disks (4-KB-per-sector), the minimum size of EFI partition is 260 MB.
  • For the 512-byte-per-sector drives, the minimum size of EFI partition is 100 MB.

create efi partition

create-efi

After finishing EFI partition creation, please restart your computer. As for the option 1 and option 3, you can turn to this topic Windows 8 can't start due to missing EFI partition in eightforums. Or look at the two screenshots to learn more:

option 1

option 3

Now you know how to quickly and effectively restore deleted Windows partition. If you accidentally delete EFI partition, just try the above ways according to your needs.

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case 2 Case 2: Accidentally Delete System Reserved Partition in Windows 10/8/7

solution 1 Solution 1: Recover Deleted System Reserved Partition

If you install your operating system Windows 10/8/7 to the MBR disk, it is possible that system reserved partition is created. However, when using your computer, the system reserved partition is deleted by mistake and then Windows can't boot. Under the circumstance, what should you do to recover deleted Windows system partition? Fortunately, MiniTool Partition Wizard Professional Edition is still useful to restore deleted Windows partition in case of unbootable Windows.

Firstly get MiniTool Partition Wizard Professional Edition "Bootable Media" to create a bootable disc and boot your computer. And then start to recover deleted partition with "Partition Recovery".

Hot article: How Can I Create a Partition Magic Boot CD?

Just select the disk containing deleted system reserved partition and then click "Partition Recovery" to start to restore deleted system reserved partition in Windows 7/8/10.

accidentally-delete-system-reserved-partition

The steps are the same to the case 1, so here we won't show you how to restore this partition in detail. Or you can watch one video to learn how to operate lost Windows partition recovery.

After finishing recovering the deleted system reserved partition, you will see this partition status shows "None". Please click "Set Active" feature to mark this partition as active partition. Otherwise, your computer won't boot.

set-active

solution 2 Solution 2: Repair System Reserved Partition Windows 10/8/7

In addition, you can also use a Windows installation media to rebuild system reserved partition in Windows 10/8/7. Just change the boot order in BIOS to boot from this media. And then bring up Command Prompt by pressing "Shift +F10" on the first screen. Follow the guidance below:

Step 1: Type "bootrec /fixmbr"

Step 2: Type the following commands

diskpart
select disk 0
list partition
select partition n: n means the drive letter of the Windows OS partition.
active
exit

Step 3: Start to fix boot information by the following commands

bootrec /fixboot
bootrec /rebuildbcd

delete-system-reserved-partition

repair-system-reserved-partition

Want to know more information about how to solve accidentally deleted system reserved partition in Windows 10/8/7? Turn to eightforums now.

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Bottom Line

In this post, we show you the issue Windows can't boot after deleting system partition, two specific cases for this issue such as deleted EFI partition by mistake and accidentally deleted system reserved partition in Windows 10/8/7, as well as the effective solutions for these two situations. From the post, you know with the help of MiniTool Partition Wizard Professional Edition, you can easily restore deleted Windows partition under the circumstance of failing to boot Windows. Or use a Windows installation media to create EFI partition or repair system reserved partition. If you are facing one of the cases, just try MiniTool Partition Wizard or use a Windows repair disc.

Should you have any question to our software or any suggestion to this post, leave your idea in the following text box. Or directly contact our support team via support@minitool.com.