Bcdedit commands windows 8

Is this page helpful? Please rate your experience Yes No. Any additional feedback? In this article. Displays a list of BCDEdit commands.

Exports the contents of the system store into a file. This file can be used later to restore the state of the system store. This command is valid only for the system store. This command deletes any existing entries in the system store before the import takes place. This option can be used with most BCDedit commands to specify the store to be used. If this option is not specified, then BCDEdit operates on the system store.

Sets the system store device. The second point is that before we make boot configuration changes, let us list the settings so that we can understand the syntax, and appreciate the scope of the configuration data. My third point is now that you have had a look at BCDEdit, I strongly recommend you take precautions and backup or export the original settings. Be aware this is not like editing an ordinary text file such as boot.

Feel free to change to a backslash if you prefer. This utility will also guide you through troubleshooting; the dashboard will indicate whether the root cause is a broken link, faulty equipment or resource overload. What I like best is the way NPM suggests solutions to network problems. Its also has the ability to monitor the health of individual VMware virtual machines.

If you are interested in troubleshooting, and creating network maps, then I recommend that you try NPM now. With this 3rd party utility you can edit every bit of BCD. Also, it can automatically create Windows loaders, and even make a one click dual-boot repair.

Assuming you are able to boot normally, you can discover more about Windows 8 boot configuration by typing: bcdedit -? Download your free copy of Config Generator. You need a good reason, and a little practice, before making real changes to the boot sequence. Setting the display order only makes sense if you have more than one operating system, in effect a dual-boot machine. The key point when configuring -displayorder is that you can only use particular GUIDs encased in curly brackets.

The knack is to research for GUIDs in sections starting with:. By default, processor groups have a maximum size of 64 logical processors. You can use this boot configuration setting to override the size and makeup of a computer's processor groups for testing purposes.

Processor groups provide support for computers with greater than 64 logical processors. This boot option is available on bit versions of Windows 7 and Windows Server R2 and later versions. This boot option has no effect on the bit versions of Windows 7. Use the groupsize option if you want to force multiple groups and the computer has 64 or fewer active logical processors. Use this option to help expose cross-group incompatibilities in drivers and components.

You can use the groupaware option and the groupsize option to test driver compatibility to function with multiple groups when computer has 64 or fewer active logical processors. The groupaware on setting ensures that processes are started in a group other than group 0.

This increases the chances of cross-group interaction between drivers and components. The maxgroup on setting assigns NUMA nodes to groups in a manner that maximizes the number of groups for a particular computer.

The number of groups created is either the number of NUMA nodes the computer has, or the maximum number of groups supported by this version of Windows, whichever is smaller.

The default behavior maxgroup off is to pack the NUMA nodes tightly into as few groups as possible. Use the maxgroup option if you want to use multiple groups, the computer has 64 or fewer active logical processors, and the computer already has multiple NUMA nodes.

This option can also be used to alter the default group configuration of a computer that has more than 64 logical processors. This option is available on bit versions of Windows 7 and Windows Server R2 and later versions. For example, the following command configures the current operating system loader to use one processor. On bit editions of Windows, applications have 4 gigabyte GB of virtual address space available.

The virtual address space is divided so that 2 GB is available to the application and the other 2 GB is available only to the system.

The 4-gigabyte tuning feature, enabled with the increaseuserva option, allows you to increase the virtual address space that is available to the application up to 3 GB, which reduces the amount available to the system to between 1 and 2 GB. Windows uses the remaining address space 4 GB minus the specified amount as its kernel-mode address space.

See 4-Gigabyte Tuning Windows for additional information about this feature. When nolowmem on is specified, this option loads the operating system, device drivers, and all applications into addresses above the 4 GB boundary, and directs Windows to allocate all memory pools at addresses above the 4 GB boundary. Note that the nolowmem option is ignored in Windows 8, Windows Server , and later versions of Windows. The pae parameter is valid only on boot entries for bit versions of Windows that run on computers with xbased and xbased processors.

Hot-add memory supports memory devices that you can add without rebooting or turning off the computer. In this case, because PAE must be enabled when the system starts, it is enabled automatically so that the system can immediately address extended memory that is added between restarts. Hot-add memory is supported only on Windows Server , Datacenter Edition; Windows Server for Itanium-Based Systems; and on the datacenter and enterprise editions of all later versions of Windows Server.

For Windows Server and later versions of Windows Server, it is supported for all processor architectures. For example, the following command removes MB of memory from the total available to the operating system associated with the specified boot entry. When you use this option, Windows ignores all memory at or above the specified physical address.

Specify the address in bytes. For example, the following command sets the physical address limit at 1 GB. You can specify the address in decimal or hexadecimal 0x This option should only be used for debugging. The option is available starting in Windows 8 and Windows Server The system defaults to using extended APIC mode if it is available.