Windows Boot Manager (BOOTMGR) is a small piece of software, called a boot manager, that's loaded from the volume boot code, which is part of the volume boot record.
BOOTMGR helps your Windows 10, Windows 8, Windows 7, or Windows Vistaoperating system start.
Boot-Loader is an easy to use software utility that provides access to the largest repository of cell phone flash files. Dual Boot Linux with Windows 10 – Windows Installed First. For many users, Windows 10 installed first will be the likely configuration. In fact, this is the ideal way to dual boot Windows and Linux.
BOOTMGR eventually executes winload.exe, the system loader used to continue the Windows boot process.
Where Is Windows Boot Manager (BOOTMGR) Located?
Configuration data required for BOOTMGR can be found in the Boot Configuration Data (BCD) store, a registry-like database that replaced the boot.ini file used in older versions of Windows like Windows XP.
The BOOTMGR file itself is both read-only and hidden, and is located in the root directory of the partition marked as Active in Disk Management. On most Windows computers, this partition is labeled as System Reserved and doesn't have a drive letter.
If you don't have a System Reserved partition, BOOTMGR is probably located on your primary drive, which is usually C:.
Can You Disable Windows Boot Manager?
Why would you want to disable or turn off the Windows Boot Manager? Simply put, it can unnecessarily slow down the boot process as it waits to ask you which operating system to boot. If you don't need to choose which operating system to boot to, maybe because you always like to start the same one, then you can avoid it by pre-selecting the one you always want to start.
However, you can't actually remove the Windows Boot Manager. What you can do is reduce the time that it waits on the screen for you to answer which operating system you want to start. You can do this by pre-choosing the operating system and then lowering the timeout time, basically skipping the Windows Boot Manager altogether.
This is accomplished through the System Configuration (msconfig.exe) tool. Here's how to do this:
Be careful when using the System Configuration tool — you might make unnecessary changes that can just cause more confusion in the future.
Windows 10 Boot Loader Usb
- Open Administrative Tools, which is accessible through the System and Security link in Control Panel.If you don't see the System and Security link on the first page of Control Panel, select Administrative Tools instead.
- Another option for opening System Configuration is to use its command line command. Open the Run dialog box (WIN+R) or Command Prompt and then enter the msconfig.execommand.
- Choose the operating system you want to always boot to. Remember that you can always change this again later if you decide to boot to a different one.
- Adjust the Timeout time to the lowest possible time, in seconds, which is probably 3.
- A System Configuration screen might pop up after saving these changes, to inform you that you might need to restart your computer. It's safe to choose Exit without restart — you'll see the effect of making this change the next time you restart.
Additional Information on BOOTMGR
A common startup error in Windows is the BOOTMGR Is Missing error.
BOOTMGR, together with winload.exe, replaces the functions performed by NTLDR in older versions of Windows, like Windows XP. Also new is the Windows resume loader, winresume.exe.
When at least one Windows operating system is installed and selected in a multi-boot scenario, the Windows Boot Manager is loaded and reads and applies the specific parameters that apply to the operating system installed to that particular partition.
If the Legacy option is chosen, the Windows Boot Manager starts NTLDR and continues through the process like it would when booting any version of Windows that uses NTLDR, like Windows XP. If there's more than one installation of Windows that's pre-Vista, another boot menu is given (one that's generated from the contents of the boot.ini file) so that you can select one of those operating systems.
The Boot Configuration Data store is more secure than the boot options found in previous versions of Windows because it lets users in the Administrators group lock down the BCD store and give out certain rights to other users to determine which ones can manage boot options.
As long as you're in the Administrators group, you can edit the boot options in Windows Vista and newer versions of Windows using the BCDEdit.exe tool included in those versions of Windows. If you're using an older version of Windows, the Bootcfg and NvrBoot tools are used instead.
Active4 months ago
I installed Ubuntu on a system that has Windows 10 installed. I can boot to Windows or Ubuntu normally using GRUB. I want to delete Ubuntu partition, but first I must restore the Windows 10 MBR.
Windows 10 Boot Loader Download
In Use Bootrec.exe in the Windows RE to troubleshoot startup issues (applies to Windows 7 and Windows Vista) they say to use Bootrec.exe with options
/FixMbr
/FixBoot
, but when I type 'bootrec.exe /FixMbr' in a command prompt, Windows says:'bootrec.exe' is not recognized as an internal or external command.
I say I can boot to Windows 10 and run a command prompt from there (I don't need to use an installation medium), but I don't know what to enter.
Peter Mortensen8,58816 gold badges62 silver badges85 bronze badges
CodyflyCodyfly
3 Answers
The command in Windows 8/8.1/10 for fixing MBR is 'bootsect.exe'.
this fixes boot record of partition mapped to 'drive_letter:' and the MBR of the disk where the partition is placed.
Alternatively you can use 'Dual-boot Repair Tool' which has a graphical interface to bcdboot.exe, bootsect.exe and other useful functions like boot sector view and ... one click dual-boot repair function for Windows 10/8/7/Vista (also can fix Windows XP boot files).
snayobsnayob4,0141 gold badge11 silver badges19 bronze badges
I was having the following issue:
I had Ubuntu and Windows 10 and deleted Ubuntu partitions using Windows 10. After a restart I got the
Partition not found
error and automatically entered GRUB.Here's how I solved it:
- I burned a Windows 10 CD, entered troubleshooting, and from there I entered Windows Console.
- Then I typed in:
bootsect /nt60 drive_letter: /mbr
(replace drive_letter with your letter. for example, for me it wasC: /mbr
). - And it finally worked.
I hope this also clarifies the solution for people with the same problem as me.
Peter Mortensen8,58816 gold badges62 silver badges85 bronze badges
TonyTony
The other answers given here work great on MBR/BIOS systems, however if you're on a UEFI system like I am,
bootsect
will just write a semi-functional boot MBR over the GPT protective MBR and bootrec
just gives an 'Access denied' error message, and neither one has a functional option to fix a broken EFI system partition, which on a UEFI/GPT drive is what contains the bootloader that used to be stored in the MBR. There's unfortunately almost no up-to-date guides on fixing the UEFI Windows Boot Manager (almost all of them just say to run the graphical Startup Repair utility, but that doesn't fix the problem in all cases), but I finally found the correct solution buried in this article, which requires the use of the bcdboot
command instead:- Grab the Media Creation Tool, make yourself a Windows 10 installation DVD or USB drive, and then boot into it.
- When prompted, choose 'Repair your computer', followed by 'Troubleshoot', 'Advanced Options', and finally 'Command Prompt'.
- Run
diskpart
and thenlist volume
. Note the volume number for your EFI system partition (ESP). - Now do
select volume x
(wherex
is the volume number for the ESP) and thenassign letter=N:
to mount the partition. Runlist volume
again and note that the ESP is now assigned a driver letter. Runexit
to leavediskpart
. - (Optional) If you are not currently dual booting and want to fully clean the ESP before writing a new bootloader, run
format N: /FS:FAT32
to reformat it as FAT32. This is probably not necessary under normal circumstances, however, asbcdboot
seems to do a good job of cleaning things up itself. Especially do not do this if you have a Linux distro on another partition or else you'll have to reinstall GRUB as well once you're done with this. Also note that the following steps should not affect an EFI GRUB install as long as you do not otherwise delete GRUB's existing directory on the ESP. - Finally, write the new bootloader to the partition with
bcdboot C:windows /s N: /f UEFI
. This command rebuilds a new UEFI-compatible bootloader on the ESP mounted at N: using the Windows installation mounted at C:windows. Once it's done, you can verify the new bootloader was written by runningdir N:EFI
, where you should see aMicrosoft
directory containing the new Windows Boot Manager as well as aboot
directory containing the fallback bootloader (along with other directories for any other bootloaders you have installed, such as GRUB for Linux). - (Optional) If you are dual booting, you will probably need to boot into your Linux distro and run
sudo update-grub
to allow the GRUB scripts to detect and add the new Windows bootloader. You should also skip the next step and leave GRUB as your first boot choice so you can access both operating systems. - Now boot into your BIOS setup and make sure 'Windows Boot Manager' is set as the top boot choice. Save and reboot and you'll finally be back in Windows.
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protected by Community♦Feb 25 '16 at 18:26
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