This post provide technical support for Windows Vista and later versions of Windows, boot options are stored in the Boot Configuration Data (BCD) store on BIOS-based and EFI-based computers.
BCD replaces the traditional Boot.ini text file in BIOS-based systems. Storing boot parameters in a text file, however simple, was considered to be too vulnerable to malicious attacks to justify its use. On EFI-based computers, where boot options are stored in NVRAM, you use the same BCD methods to edit boot options as you would use on a BIOS-based computer, instead of accessing NVRAM directly using Windows APIs or specialized tools.
BCD provides a common, firmware-independent boot option interface for all computers running Windows Vista. It is more secure than previous boot option storage configurations, because it permits secure lockdown of the BCD store and lets Administrators assign rights for managing boot options. BCD is available at run time and during all phases of setup. You can even call BCD during power state transitions and use it to define the boot process for resuming after hibernation.
You can manage BCD remotely and manage BCD when the system boots from media other than the media on which the BCD store resides. This feature is extremely important for debugging and troubleshooting, especially when a BCD store must be restored while running Startup Repair from a CD, from USB-based storage media, or even remotely.
Most importantly, BCD is easy to use. The BCD store, with its familiar object-and-element architecture, is easy to use. It uses GUIDs to precisely identify boot-related applications.
This new data format for BCD uses a new set of boot options. Most of the Windows boot options that were used in previous versions of Windows, such as /debug, /maxmem, and /pae, have been preserved; however, in some cases, the names of the options might have changed to better suite their function. For more information about these boot options, see BCD Boot Options Reference.
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