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This is where the "/enum" command is useful. The first function that all developers need is a way to list what bootable operating systems are available on a machine. Obtaining List of Current Bootable Operating Systems Rather than explaining all the capabilities of BCDEDIT, the rest of this section focuses on the common operations a developer might use to modify the system's boot behavior.
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MASTER REBOOT VISTA PLUS
The interface consists of data tables that contain platform-related information, plus boot and runtime service calls that are available to the operating system and its loader. According to Intel:ĮFI defines a new model for interface between operating systems and platform firmware. Recently a new specification called the Extensible Firmware Interface (EFI) was created.
MASTER REBOOT VISTA WINDOWS
How does NTLDR know which Windows operating systems are available? On an x86 system this information comes from a file named "BOOT.INI" that is located in the root directory of the drive containing the booted MBR. NTLDR is also responsible for helping load the selected Windows O/S. In the case of Windows, the boot program transfers control to NTLDR, which is responsible for displaying the Windows startup menu. When the boot program finishes executing, it is responsible for transferring control to the loaded O/S.
MASTER REBOOT VISTA CODE
The Master Boot Code contains a small initial boot program that the BIOS loads and executes to start the boot process. The Master Partition Table contains the description of the disk layout in terms of partitions. The MBR is always located on the first sector of the disk and contains two items: 1) the Master Partition Table and 2) the Master Boot Code. A formatted local hard drive that is bootable contains a Master Boot Record (MBR) that the BIOS (Basic Input/Output System) reads on startup. This means that Windows must have a method to find this information on various architectures.įor most PCs, the boot occurs from the local hard drive. Different system architectures have different presets. To do this, the system must have some preset location or locations (hard drive, network, or some other source) to determine when a boot or restart occurs.
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This article describes new processes for managing boot options in Windows Vista, using the utilities BCDEDIT and MSCONFIG.Īs you all know, when a system is booted or restarted it must load an operating system. In short, say good bye to boot.ini, and hello to the Boot Configuration Database. Just one of these changes will affect the way users modify boot options and manage debugging connections. Windows Vista is bringing plenty of changes our way. The NT Insider, Vol 13, Issue 4, July - August 2006 | Published: 20-Sep-06| Modified: 20-Sep-06 Tooling Around with Vista - Modifying Windows Boot & Debug Options in Vista