When the BCD file system on your system is corrupted, you will not be able to access the operating system. You may try to rebuild BCD by using the following command:
You may receive some error messages when you execute these commands, such as:
- rebuildbcd the requested system device cannot be found
- bcdedit import the requested system device cannot be found
Why does the "the requested system device cannot be found" error occur? How can we fix this error? Don't worry. This troubleshooting guide will help you cover all aspects of the error and provide you with an effective solution to resolve it.
When using USB installation media to fix Windows unbootable problems, many reasons cause the requested system device cannot be found error. Here are some of the main reasons:
1. USB drive interface error
Even if the BIOS supports the given USB slot, you need to check the USB interface. The Windows repair environment cannot detect the USB 3.0 interface. You can try to replace the USB with a 2.0 interface.
2. BIOS partition type not updated
3. EFI partition is missing or corrupted
On GPT disks, the system requires an EFI partition. If it is lost, you need to recreate EFI partition. While on MBR disks, you need to set the partition where the BCD registry files are stored as the active partition.
4. Windows did not find the correct partition
Windows will access the installation path on the local disk by default. If you boot from the installation media USB drive, there is a chance that the correct system partition will not be found.
5. Windows installation and USB boot mode are incompatibilities
The bootable USB should also fit the older BIOS if Windows is installed using an older BIOS.
After understanding these possible causes of the requested system device cannot be found, you can find a solution based on the specifics of your problem. Let's take a look at the next section.
In response to the problems that emerged in the previous section, this article summarizes the solutions in the following ways:
Of these methods, fixing one is the quickest and easiest. Next, we will start with the most effective ways one by one.
EaseUS Partition Master is a third-party tool to repair the corrupted MBR. It can rebuild the MBR without losing data.
Because Windows cannot boot successfully, you need to connect the drive to another computer to repair it or use the tool to create a WinPE bootable disk to access the inaccessible operating system.
Step 1. Create a WinPE bootable disk
- Launch EaseUS Partition Master, and click "Bootable Media" on the toolbar. Select "Create bootable media".
- Click "Next" to finish the process.
Step 2. Boot EaseUS Partition Master Bootable USB
- Connect the bootable USB or CD/DVD to your PC.
- Press F2 or Del when you restart the computer to enter the BIOS screen. Set and boot your computer from "Removable Devices" or "CD-ROM Drive". And then EaseUS Partition Master will run automatically.
Step 3. Rebuild MBR
- Click "Toolkit" and choose "Rebuild MBR".
- Select the disk and the type of MBR. Then, click "Rebuild".
- After that, you can see "MBR has been successfully rebuilt on Disk X".
You can try to make a Windows installation media using a DVD/CD if Windows PE or Windows cannot detect USB 3.0 or USB 3.0 drives. Follow the steps below to repair Windows with Windows repair DVD/CD:
Step 1. Choose Command Prompt on the Advanced settings screen starting Windows from the DVD or CD.
Step 2. Input the following command and hit Enter after each command:
To test whether this works, restart your computer. As an alternative, you can resolve the problem by typing bcdboot.exeC:Windows /s C: directly at the prompt under Windows Recovery Environment.
When trying to perform Bootrec operations with a USB installation media, you may fail to find the system partition. You need to select the correct partition in the command prompt. And follow the steps below to fix the requested system device cannot be found issue.
Step 1. Launch Windows 10 using a UEFI installation disk (CD, DVD, or USB), and select Command Prompt from the Advanced settings screen.
Step 2. Type the following command and hit Enter. Please be aware that the EFI partition should be in FAT32 format.
select volume 3
Step 3. After leaving the diskpart, type the following command:
Step 4. To rename the BDC file from BCD to BCD.bak, type ren BCD BCD.bak and hit Enter.
Step 5. To regenerate BCD, type bcdboot c:Windows /l en-us /s z: /f ALL and press Enter.
Step 6. Exit the command prompt and restart the computer.
When you meet the requested system device cannot be found issue, don't panic. In this guide, you can know why you meet this issue and find the responding solution to fix it. This guide provides three ways for you. At the same time, the easiest way is to try EaseUS Partition Master to rebuild or repair MBR. It is a powerful tool related to a disk partition. If you have any problem, you can try it.
FAQs About the Requested System Device Cannot Be Found
This part will provide frequently asked questions and answers about the requested system device cannot be found. If you are interested, keep reading.
1. Why is Fixboot access denied?
It frequently has to do with the Master Boot Record, or MBR, a crucial component of every hard drive partition. Your machine won't be able to boot into Windows if the MBR on your primary hard disk fails.
2. Can I repair MBR?
Of course, you can repair MBR. Corrupted MBR will make you unable to boot Windows. You can use the command prompt or a third-party tool to repair it, such as EaseUS Partition Master. It will help you create bootable media and integrate BIOS to rebuild MBR.
3. What causes corrupted MBR?
Unexpected system shutdowns, virus attacks, or other malware attacks can cause the Master Boot Record to become corrupt, which can completely impair the operation of the operating system by changing its programs.
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Cici is the junior editor of the writing team of EaseUS. She accepted the systematic training on computers at EaseUS for over one year. Now, she wrote a lot of professional articles to help people resolve the issues of hard drive corruption, computer boot errors, and disk partition problems.
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