Windows Boot Manager loads from the volume boot code, which is part of the volume boot record. It helps your Windows 10, Windows 8, Windows 7 or Windows Vista operating system to start.
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Boot Manager, often referred to by the name of its executable file BOOTMGR, ultimately executes winload.exe, the system loader used to continue the Windows boot process.
Configuration data required by Boot Manager is located in the Boot Configuration Data store, a registry-like database that replaced the boot.ini file used in older versions of Windows, such as Windows XP.
The BOOTMGR file itself is both read-only and hidden. It is located in the root directory of the partition marked Active in Disk Management. On most Windows computers, this partition is marked System Reserved and is not assigned a drive letter.
