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The most difficult part with dual-boot or multi-boot is that the boot manager does not always recognize older operating systems. This may be because older operating systems use a different bootloader type than before Windows Vista or simply because Windows has not assigned a drive name for missing operating systems.
Start configuration data editor (BCD)
The command line tool Bcdedit.exe changes the start configuration data memory. The boot configuration data memory contains boot configuration settings and controls how the operating system is booted. These parameters were previously found in the Boot.ini file (in BIOS-based operating systems) or in non-volatile RAM inputs (in Extensible Firmware Interface-based operating systems). With Bcdedit.exe, you can add, delete, edit and add entries in the boot configuration data memory.
This article focuses on the boot configuration data editor and tries to answer how it can help you, errors such as the operating system not found, the impossibility of detecting secondary and tertiary operating systems in case of multiple starts and similar errors.
Why switch from Boot.ini to BCD
BCD was developed to provide an improved mechanism to describe boot configuration data. When developing new firmware models, an extensible and interoperable interface was needed to abstract the underlying firmware. This new design forms the basis for a variety of new features in Windows Vista, Windows 7, Windows 8, Windows 10, as the startup repair tool and multi-user installation shortcuts.
What is the BCD Editor
The BCD Editor is provided as a graphical interface in Windows. There are not many options, but you can repair the boot manager and repair the main boot record from the graphical user interface.
The graphical user interface also allows you to solve problems where bootmgr is missing in some cases.
BCD register location
The Boot Configuration Data Store contains boot configuration parameters and controls how the operating system is booted.
The BCD register is located in the ootcd folder of the active partition.
For EFI-based systems, the default BCD register location is on the EFI partition.
Read: How to save and restore a BCD file under Windows.
BCD editor command line version
BCD editor command line version is very powerful and can be used for a variety of functions :
- Deleting entries from a BCD memory
- Get a list of active parameters
- Get entries of a specific type and
- Apply a global change
To see, what else you can do with BCDEdit. exe, type bcdedit.exe /? at the command prompt. All the options and operations you can perform with the BCD editor from the command prompt are listed.
If you intend to use two or more operating systems, note the following :
- Install Windows Vista or later on another partition. Usually, each operating system should have its own partition, because otherwise common folders like Windows, programs, etc. can cause conflicts and crash your computer. However, if you plan to use older operating systems, first install the operating systems before Windows Vista so they can continue to use boot.ini, and then
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