Are you encountering the selected disk is not a fixed MBR disk error? Then, follow the instructions mentioned in this article. You can fix this by converting the disk to MBR, fixing the boot manager and turning on the UEFI in BIOS.

Here’s how to fix the selected disk is not a fixed MBR disk

· Convert the Disk to MBR

1. In case the computer is slow, start using the installation media for installing Windows for this procedure.

2. Place the installation drive.

Source: Fix the Selected Disk , Brother Printer Support

Otherwise, start booting the system.

4. Now, you will get the Choose your keyboard layout option.

5. You need to select the options screen to go to the Troubleshoot option.

6. Click on the Advanced Options button.

7. Click on the Command Prompt menu.

By going to the Command Prompt menu, enter the “diskpart” in the new window.

Press on the Enter button.

10. You can turn on the many Diskpart commands.

11. You need to open the command which lets you view the menu list of the volumes which are available now.

12. Enter the below-mentioned command:


13. Ensure that you select the drive properly, but it depends on the menu list of all the volumes.

14. Open the below-mentioned command for choosing the USB drive:

15. Now, you will get the text “Volume 3 is the selected volume” on the screen.

16. If you wish to remove the volume, enter the command mentioned below:

DISKPART> select volume 3

Press on the Enter button.

18. Now, this procedure will help you to change the disk to MBR.

· Fixing the Boot Manager

In case your system is working slow, then start using the installation media for installing the windows for this procedure.

2. Place the installation drive.

Now, you will get the Choose your keyboard layout menu so select the one which you wish to use.

4. After that, you will get the Choose an option screen on the desktop.

5. Click on the Troubleshoot option.

6. Press on the Advanced Options button.

7. Click on the Command Prompt menu.

8. In case you are not facing any error with the computer, then start using the Windows UI for accessing the display.

9. In case you are the Windows 10 user on the system, then choose the additional way for accessing the Advanced Startup on the system.

10. Start using the Windows and I keys together.

11. It will launch the Settings tab.

12. Otherwise, press on the Start menu.

13. Press on the gear key.

14. It is given at the end of the left-hand side of the screen.

15. Press on the Update and security option.

16. Press on the Recovery option.

17. Press on the Restart Now option.

18. It is given below the Advanced startup column.

19. Press to launch the Command Prompt menu by going to the Advanced options display.

Now, you will get the Command Prompt with the admin privileges on the screen.

Enter the below-mentioned command:

bootrec /RebuildBcd

bootrec /fixMbr

bootrec /fixboot

22. Exit the Command Prompt.

23. Select the Restart option.

24. Check if you have fixed this issue or not.

· Turn on the UEFI in BIOS

1. Switch on the computer.

2. Type the BIOS settings tab by clicking on the BIOS KEY.

Start using the right arrow key to select the Security menu.

4. After opening the BIOS settings tab.

Start using the down arrow key to choose the Secure Boot Configuration button.

6. Click on the Enter option.

7. Find the Boot Mode option.

8. Start changing its value into legacy.

Sofia Williams
is a writer, tech enthusiast, and futurist. She has published several articles online wherein she has explored advanced technologies, news, and trends revolving AI, operating systems, social media, gaming, Brother printer support, like brother, Lexmark printer support and epson printer support etc.