Windows 7 and Windows 8 typically install on a Legacy BIOS that uses Main Boot Record (MBR). However, Windows 11 and Windows 10 are designed to install on the UEFI BIOS using the EFI bootloader and GPT.
You should also specify the topmost Windows boot loader application in the Windows Boot Manager display order. The following example shows how to put a specified Windows boot loader at the top of the display order.
Windows Loader Gpt
A multiboot system that has multiple installed operating systems has multiple instances of the Windows boot loader. Each instance of the Windows boot loader has its own identifier. You can set the default Windows boot loader (default) to any of these identifiers.
A BCD store has at least one instance, and optionally multiple instances, of the Windows boot loader. A separate BCD object represents each instance. Each instance loads one of the installed versions of Windows that has a configuration that the object's elements have specified. Each Windows boot loader object has its own identifier, and the object's device and path settings indicate the correct partition and boot application.
To simplify BCDEdit commands, you can specify one of the Windows boot loaders in the BCD system store as the default loader. You can then use the standard identifier (default) in place of the full GUID.The following example specifies the Windows boot loader for EFI as the default boot loader, assuming that it uses the identifier GUID from BCD-template.
For the Windows boot loader for EFI, both elements are usually set to the drive letter of the Windows system partition. However, if BitLocker is enabled or a computer has multiple installed versions of Windows, osdevice and device might be set to different partitions.BCD-template sets both elements to drive C, which is the typical value. You can also explicitly set the osdevice and device values, as shown in the following example. The example also assumes that you have specified the Windows boot loader for EFI as the default boot-loader object.
The path element of a Windows boot loader specifies the location of the boot loader on that volume. For UEFI systems, path indicates the Windows boot loader for EFI, whose path is \Windows\System32\Winload.efi.
UEFI or Unified Extensible Firmware Interface is an extension of firmware that can read from entries from disk partitions and boot Windows, i.e., an interface between the operating system (OS) and the platform firmware. Windows UEFI boot loader is responsible for loading the Windows OS and initializing other devices on the laptop. If the UEFI boot loader gets corrupted or damaged, you will not be able to boot into Windows unless restored.
I found the video solution for windows 10 missing from grub menu and the forum thread Grub not recognizing Win10 after Update/Repair, but unfortunately neither worked for me so I used a combination of these two to resolve my problem.
You should review your bios/uefi settings. In my case I had to let Uefi boot first. Otherwise I wasn't able to detect windows from ubuntu. What I had to set was ubuntu > Windows Boot Manager > DISK1 > DISK2 > DISK3. Insted DISK1 > ubuntu > Windows Boot Manager > DISK3.
Here I am interested in restoring access from Fedora boot loader to my Windows 10 installation. (I had a Linux Mint in place of Fedora, and Mint had access to Windows but not to Solus. I have thought that replacing Mint with Fedora would fix the problem: it did not, it added a new one.)
thanks a lot! getting closer and closer The Grub menu appears when I boot Fedora in Bios but if I turn on the laptop it will start windows directly. Is it something I need to configure in Windows so it recognizes a dual boot?
The BIOS does things like configure the keyboard, mouse, and other hardware, set the system clock, test the memory, and so on. Then it looks for a drive and loads the boot loader on the drive, which is either an MBR or GPT partition table.
I'd like to install linux, but I don't want to risk damaging my current windows installation as I have heard a lot of horror stories. Fortunately, I have an extra hard drive. Can I install linux onto that and then dual boot windows without having to modify the windows drive?
First, a word about drive order and boot order. Drive order refers to the order in which the drives are physically connected to the bus on the motherboard (first drive, second drive, etc.); this information is reported by the BIOS. Boot order refers to the sequence in which the BIOS checks for a bootable drive. This is not necessarily the same as the drive order, and is usually configurable via the BIOS set-up screen. Drive order should not be configurable or affected by boot order, since that would be a very OS unfriendly thing to do (but in theory an obtuse BIOS could). Also, if you unplug the first drive, the second drive will likely become the first one. We are going to use UUIDs in configuring the boot loader to try and avoid issues such as this (contemporary linux installers also do this).
The ideal way to get what you want is to install linux onto the second drive in terms of drive order and then select it first in terms of boot order using the UEFI set-up. An added advantage of this is that you can then use the BIOS/UEFI boot order to select the windows drive and bypass grub if you want. The reason I recommend linux on the second drive is because GRUB must "chainload" the Windows native bootloader, and the windows bootloader always assumes it is on the first drive. There is a way to trick it, however, if you prefer or need it the other way around.
Then keep reading. In the second case, you should first try and re-install linux onto the second disk, and this time make sure that's where the bootloader goes. The easiest and most foolproof way to do that would be to temporarily remove the Windows drive from the machine, since we are going to assume there is nothing extra installed on it, regardless of drive order.
GRUB needs to be able to find and hand off the boot process to the second stage Windows bootloader. We already have the path on the Windows partition, but we also need some parameters to tell GRUB where that partition is. There should be a tool installed on your system called grub-probe or (on, e.g., Fedora) grub2-probe. Type grub and then hit Tab two or three times; you should see a list including one or the other.
Classically, hard drives would follow what is known as an MBR partitioningscheme, a Master Boot Record (MBR) stored in the first 512 Bytes of the storagedevice containing the boot loader (the first 440 Bytes) and the partitioningtable.
Concerning Bootloaders, I personally use Systemd-boot as it is part ofsystemd (already installed on my distribution) and I find it is easier than GRUBfor UEFI-GPT. As such the ESP is mounted to /boot and contains the kernel andinitramfs files. Systemd-boot auto-detects the Windows Loader and adds an optionfor it, although the Linux systems need manual entries, but this is simple to do(refer to my arch install post).
This error indicates that the file at the above EFI\Microsoft\Boot\BCD address is corrupted and because of that the data in the Boot Configuration Data file does not recognize your Windows boot loader configuration.
In this chapter, we decided to review the GPT disk structure for Windows 10 so that the user can more easily understand how UEFI works, so that the user can identify which partition contains the EFI boot loader and so that the user does not accidentally format this partition.
The EFI partition is mandatory on GPT disks with UEFI support. When the computer powers on, the UEFI environment loads the boot loader (EFI\Microsoft\Boot\bootmgfw.efi) from the EFI partition (ESP), giving it control over booting Windows itself. Accordingly, if there is no such partition or the files on it are corrupted, the system will not be able to boot.
The boot loader recovery procedure integrated into the Windows recovery environment (WinRe) is not a bad solution, although it is not always possible to fix the EFI boot loader using this method. However, it is still worth trying.
After that, the system will try to repair the EFI boot loader automatically. If all goes well, your boot loader will be fine and the system will boot again. If you see an error message, try the method below.
Operating system problems always increase the chance of important data loss. But when it comes to problems with the EFI boot loader, the probability of accidentally deleting important files or damaging the logical structure of the disk simply increases manifold.
In order to load the operating system, a Linux-capable boot loader such as GRUB, rEFInd or Syslinux needs to be installed to the Master Boot Record (MBR) or the GUID Partition Table (GPT) of the media containing the Operating System. Installations created using Manjaro ISO defaults to GRUB.
For various reasons - it happens the bootloader get's corrupted, erased or misconfigured resulting to a black screen with a failure message during boot, like No boot loaders found in /dev/.... To restore system operation without re-installing your OS or losing your data you will need to use your Manjaro installation media, such as, a CD/DVD or USB Flashdrive.
On a BIOS/GPT system there is no MBR and therefore no place to store the loader. The GPT partition specification allows for an unformatted partition of the BIOS boot partition type (0xEF02). The size of this partition can be as small as 1 mebibyte. The Calamares installer uses a fixed size of 32 mebibyte. On a BIOS/MBR system a part of the bootloader is written to the Master Boot Record for the primary disk.
UEFI is known as Unified Extensible Firmware Interface that works as a "middleman" to connect a computer's firmware to its operating system. Many users encounter the boot issue when running the Windows 10 bootloader repair on a GPT hard disk. What causes the problem? How to repair Windows 10 bootloader smoothly? The following section will discuss them in detail. 2ff7e9595c
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