Windows Boot Files for the A+ Certification Exams
Windows utilizes four boot files, and you will need an understanding of all four of them for the A+ Exam. The four boot files for Windows are:
bootmgr: Operating system loader code; similar to ntldr in previous versions of Windows.
Boot Configuration Database (BCD): Builds the operating system selection menu and data resides in the BCD store. You can edit the boot configuration data with the bcdedit utility.
winload.exe: Loads the Windows operating system if selected from the operating system selection menu provided by BCD.
winresume.exe: Resumes the Windows operating system if the system is started from a hibernate state.