Fixed|Samsung SSD BOOTMGR Is Missing in Windows 7, 8, 10

Sometimes, you may meet the “BOOTMGR is missing error” on Samsung SSD after you perform Samsung data migration or cloning. Here, we will tell why this error appears and how to fix it effectively.


By Lucas / Updated on May 12, 2023

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Windows Boot Manager, also known as BOOTMGR, is a kind of small program that locates in the root directory of the partition marked as Active in Disk Management. The BOOTMGR file is set as read-only and hidden, so that it won’t be deleted accidentally. Usually, the partition that contains the BOOTMGR is System Reserved partition and does not have a drive letter. In some cases, it is in the C drive.

The function of BOOTMGR is to assist Windows operating system booting. BOOTMGR eventually executes winload.exe the system loader used to continue the Windows boot process. BOOTMGR works closely with Windows Boot Configuration Data (BCD) as well.

Samsung SSD migration BOOTMGR is missing

“I purchased a Samsung SSD 840 EVO and would like to move my Windows 7 copy from the hard disk drive to the SSD. Performed data migration with Samsung Data Migration software and it completes successfully. However, when I select the cloned Samsung SSD in BIOS to boot, it prompts: BOOTMGR is missing. Press Ctrl + Alt + Del to restart. Did as suggested, but the same screen comes again. What is the problem? How can I get Windows successfully boot from Samsung SSD?”

BOOTMGR is missing

It is a case about Samsung SSD 840 BOOTMGR is missing in Windows 7. Similar return message would be: BOOTMGR is missing. Press any key to restart. Actually, it is not a rare problem occurs in Windows 10, Windows 8 or Windows XP. Mostly, it happens after cloning from one disk to another. In a few cases, the error appears just after Windows startup. Then, why would this error occurs?

Why you get Samsung SSD BOOTMGR is missing error?

In a nutshell, several causes account for why operating system cannot boot and pops out the “BOOTMGR is missing” error.

  • Some partition missed during the cloning. As mentioned before, the BOOTMGR mostly locates in System Reserved partition. The operating system cannot start if you did not clone that partition in the process of data migration. Then you can perform a complete clone again via a reliable.disk cloning softwa

  • The MBR is corrupted or missing. If the master boot record of the drive is damaged, Windows will not be able to boot as well.

  • The BIOS of your computer is outdated.

  • Your computer’s boot volume usually C drive is corrupted.

  • Hard disk problem.

After knowing the reasons for the error in Windows, it is more important to learn how to fix the BOOTMGR is missing in easy ways.

How to fix BOOTMGR is missing in Windows 7 on Samsung SSD?

Since the error may caused by different reasons, you can try following solutions to see if they are helpful. But before that, it is suggested to disconnect all external connections.

Method 1. Upgrade BIOS version

If the BIOS is out of date, you are likely to receive the error because of incompatibility. Therefore, the first thing you need to do is to make sure it is the latest version. If not, upgrade to the latest one. You can download a newer version from the manufacture website or consult the Support if you have any problem.

Method 2. Repair boot sector or boot volume

You may need a Windows installation disc in this method.

1. Insert the installation disc and boot off your computer. To boot from the disc, you need to change boot priority in BIOS.

2. At the installation interface, click Repair your computer in the lower left corner.

3. Select the operating system that installed before and click Next to start Windows Startup Repair process.

Startup Repair

Method 3. Check hard disk for errors

It also could be the problem of hard disks, both hard drive and Samsung SSD. Therefore, you need to perform a disk checking. Learn how to do that in CMD.

1. Press Win + R to open Run box. Input cmd and press Enter.

2. At the prompt, type chkdsk D: /f and hit Enter. If it prompts to restart, type Y or Yes to confirm.


Tip: for more information about hard disk checking, please visit check hard drive for errors in Windows 10.

Method 4. Rebuild MBR for hard drive

If you can access Command Prompt through Windows installation disc or Windows repair disc, input following commands to rebuild MBR.

  • bootrec /fixmbr

  • bootrec /fixboot

  • bootrec /scanos

  • bootrec /rebuildbcd




Fix Mbr


Wait for the process to be completed and restart your computer. Nevertheless, if you cannot access the Command Prompt out of Windows environment, or you find the command line operations is a little complicated to operate, it is suggested to try another tool, AOMEI Partition Assistant Standard.

It is a piece of free partition software that allows you to fix MBR for hard drive or cloned Samsung SSD in graphical user interface. The software is tiny with no bundled software. Feel free to download and have a try.

Download Freeware Win 10/8.1/8/7/XP
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1. Install and launch AOMEI Partition Assistant Standard. Right click the system disk and select Rebuild MBR

Rebuild System Disk Mbr

2. Choose MBR type for your operating system.

Choose Mbr Type

3. Click Apply and then Proceed to execute. Now, you may be able to solve Samsung SSD clone BOOTMGR missing trouble.


1. Click to create a bootable media if you cannot boot your computer.
2. You can check partition with AOMEI Partition Assistant as well.

The advanced version AOMEI Partition Assistant Professional provides more powerful features like allocating free space from one partition to another without resizing and formatting. Upgrade to experience more.


When you get Samsung SSD BOOTMGR is missing error, don’t worry, you have different ways to fix it. AOMEI Partition Assistant is also a disk cloning software. It is not bad to give it shot when Samsung Data Migration failed.

Lucas · Staff Editor
I prefer peaceful and quiet life during vacation,but sometimes I watch football match if my favorite club performs brilliantly in that season. And I love reading, painting and calligraphy, thus I send my friends festival handwriting cards every year.