You can use this powerful Windows 7, Windows 8 and Vista utility comfortably without going to command line.Īfter execution of Repair BCD a default boot menu entry for the system specified by "Windows Folder" will be created. Repair BCD is a GUI interface to bcdboot.exe utility. Īnd one more - boot chain is signed and checked on boot for the correct signatures! Which means that you should be extremely careful when messing around with boot files (I would never manually copy boot related files - every OS has the proprietary system tools to manipulate boot related files!). The basic boot sequence for newer computers with UEFI firmware and GPT disks is:īoot manager from EFI System partition => winload(on OS partition) => kernel => drivers. This is absolutely necessary if you plan to dual/multi boot Windows/Linux. MBR => PBR => boot manager => winload => kernel). Almost every problem with booting Windows (or other OS like Linux) created by users is connected with little or no knowledge about disk structure/partitions and not understanding the basic boot sequence (e.g. Note: I would suggest that you gain basic knowledge about partitions and MBR/GPT style disk formats. Windows refuses to boot also if there is no MS Reserved partition. The presence of EFI System partition is crucial for UEFI boot. On UEFI/GPT disk boot files are stored under "\EFI" folder on EFI System partition(ESP). If in doubt use "Automatic Repair" option which automatically selects correct parameters for repairing MBR, active partition boot sector and BCD in a single/dual/multi-boot system based on Windows 7/8 or Vista.įor UEFI boot (implemented on newer computers) MBR and partition boot sectors are not used anymore! PLEASE DO A BACKUP OF YOUR BCD NOW! (see paragraph 3. Not choosing correct parameters can make your system non bootable! Windows 7,8,10 Dual-boot Repair utility Help Advanced options
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