![]() It can be identified by its volume label, or more precisely by its size (500 MB for Windows 10+, 350 MB for Windows 8.1, and 100 MB for Windows 7). Run the commands:Ĭheck if there is a System Reserved partition on the hard disk. Your next steps depend on whether the disk has a separate System Reserved partition or not. ![]() Next, use the using BCDedit command to create a new Boot Configuration Data file (it is supposed, you don’t have the BCD backup file). How to Recreate a Windows Boot Configuration (BCD) from Scratch? If the OS doesn’t boot, follow the instructions below. Total identified Windows installations: 1 D:\WindowsĪdd installation to boot list? Yes/No/All:īootrec /RebuildBcd – recreate the bootloader configuration store, add copies of Windows found on the computer to the BCD bootloader.Īfter that, restart your computer and check if Windows boots properly. Successfully scanned Windows installations. Please wait, since this may take a while. If the scan is successful, you will be prompted to add entries about found Windows instances to the BCD configuration: Scanning all disks for Windows installations. Run these commands:īefore moving on, try to automatically rebuild the BCD bootloader configuration with the following commands (this is the easiest way for beginners):īootrec /FixBoot – the command creates a new boot sector on the system partition and overwrites the boot record of the PBR partition.īootrec /ScanOs – scan all drives and look for installed copies of Windows that are not in the Boot Configuration store Next, you need to identify the local drives and volumes on your computer (most likely the drive letters assigned to them will be different from those you see when working in Windows). If there is no asterisk in the GPT column, then you have the MBR partition table on the disk, and you can continue to follow this guide.This means that you have a computer with UEFI, and to restore Windows the bootloader, you need to use the article from the link above If a disk has an asterisk ( *) in the Gpt column, then the GPT partition table is used on this disk.How to understand if you have a computer with BIOS or UEFI? The easiest way is to check the disk partition table on which Windows is installed: GPT or MBR. On computers with UEFI firmware, you need to use the following guides to repair the EFI bootloader on Windows 10 or to restore deleted EFI partition. All instructions given below are suitable for standard BIOS computers (or booting in UEFI legacy mode) with the MBR partition table. yy is the minor reason number (positive integer less than 65536).Very important. xx is the major reason number (positive integer less than 256). u indicates that the reason is user-defined. p indicates that the restart or shutdown is planned. Provide the reason for the restart or shutdown. The /f parameter is implied when a value greater than 0 is specified for the /t parameter. A maximum of 512 characters allowed.įorce running applications to close without forewarning users. If the time-out period is greater than 0, the /f parameter is implied.Ĭomment on the reason for the restart or shutdown. The valid range is 0-315360000 (10 years), with a default of 30. Set the time-out period before shutdown to xxx seconds. Go to the advanced boot options menu and restart the computer. ![]() Must be used with /s option.Ĭombine with a shutdown option to cause the next boot to go to the firmware user interface.ĭocument the reason for an unexpected shutdown of a computer. Performs a shutdown of the computer and prepares it for a fast startup. Turn off the local computer with no time-out or warning. Combine with /fw to clear any pending boots to the firmware. This can only be used during the time-out period. After sign in, restart any registered applications.Ībort a system shutdown. After the system is rebooted, if Automatic Restart Sign-On is enabled, automatically sign in and lock the last interactive user. After sign in, restart any registered applications.įull shutdown and restart the computer. On the next boot, if Automatic Restart Sign-On is enabled, automatically sign in and lock the last interactive user. This cannot be used with /m or /d options. Display the graphical user interface (GUI).
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