The selected disk is not a fixed MBR disk message on Windows 10

Disk Management together with the DISKPART utility on Windows 10 are useful tools for managing their disk infinite allotment together with more. But or therefore users are reporting an mistake The selected disk is non a fixed MBR disk when trying to role the DISKPART utility. The whole mistake states:

The selected disk is non a fixed MBR disk. The ACTIVE ascendence tin post away solely travel used on fixed MBR disks.

The mistake occurs solely when y'all attempt to activate a disk segmentation on a UEFI System Partition. However, the ascendence solely plant when y'all accept a BIOS/MBR-based system. UEFI method has no concept of the active partition.  Since y'all accept a UEFI system, the disk type is GPT instead of MBR. To summarize, BIOS needs MBR disk type, spell UEFI needs GPT type disk.

The selected disk is non a fixed MBR disk

There are a duad of fixes that may attention y'all resolve the “ACTIVE ascendence tin post away solely travel used on fixed MBR disks.” You may accept to disable UEFI or brand a disk a fixed MBR disk. The same mistake tin post away travel on if y'all role “INACTIVE” ascendence on BIOS/MBR system.

1. Disable UEFI
2. Convert the disk to MBR
3. Fix the Boot Manager

1] Disable UEFI

You may accept to disable Secure Boot inwards the BIOS settings. It is done past times booting the reckoner into Advanced Startup Options together with turning off Secure Boot selection nether UEFI Firmware Settings. Once done, brand certain to enable Legacy Support. Save the changes, together with reboot your computer.

Every OEM has its agency of implementing the options. Secure Boot is commonly available nether Security > Boot > Authentication Tab. Set it to Disabled.

Do role this equally a temporary mensurate equally disabling Secure Boot would brand your reckoner ‘less secure’.

2] Convert the disk to MBR

You quest to alter the drive’s File System from GPT to MBR. But earlier y'all practice this, backup your information to an external crusade showtime equally y'all volition lose y'all existing data.

Having done that, create a Bootable Windows 10 Media. After booting from it, click on Repair your computer on the showtime Windows 10 installation setup window. Select the operating arrangement segmentation from the options y'all teach together with therefore click on Next.

Choose Command Prompt within the System Recovery Options box together with type in-

diskpart

This volition initiate the Diskpart utility within of the Command Prompt. Then type inwards either-

list disk

or

list volume

These commands volition attention y'all inwards either listing all the Disks connects or all the partitions on those disks formed.

From here, y'all volition accept to guide 1 ascendence depending on the list command y'all entered.

Type in-

select disk #

or

select book #

Hit Enter. This volition select the Disk or Partition y'all desire to select.

Finally, type in-

clean

Hit Enter. This will clean your drive.

Finally, type inwards the next to convert the select book equally MBR,

Convert MBR

Reboot your reckoner together with cheque if that fixed your issues.

3] Fix the Boot Manager

If y'all tin post away access Advanced Startup Options, therefore opened upwardly the Command Prompt together with role it to rebuild BCD.

If y'all cannot, therefore y'all volition quest to make a bootable Windows 10 USB drive and then boot your computer using it. Then when y'all teach the Welcome Screen to click on Next, together with therefore click on Repair your reckoner on the bottom left part of the window.

Next click on Troubleshoot > Advanced Options > Command Prompt.

Now, 1 time y'all accept got the Command Prompt window open, execute the next commands 1 past times 1 inwards the sequence –

bootrec /FixMbr

bootrec /FixBoot

bootrec /RebuildBcd

Finally, unopen the Command Prompt window, reboot your reckoner together with come across if it helped.

All the best!

Source: https://www.thewindowsclub.com/

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