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

Disk Management and the DISKPART utility on Windows 10 are useful tools for managing their disk space allocation and more. But some users are reporting an error The selected disk is not a fixed MBR disk when trying to use [...]

This post The selected disk is not a fixed MBR disk message on Windows 10 is from TheWindowsClub.com.

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Error Windows cannot be installed to this disk. The selected disk has an MBR partition table.

Hello,

Thank you for posting your query on Microsoft Community.

I understand your inconvenience. Don’t worry. We will assist to resolve this issue.

The error message is saying that your BIOS is UEFI but your disk's partition system is not GPT. In order to verify this claim:

• Open any CLI (cmd or PowerShell)
• Right click on the start button and select Command Prompt (Admin).
• Type "diskpart" (without the quotes) and hit Enter.
• Wait for it to load (the command line will begin with DISKPART>)
• Type "list disk" (without the quotes) and hit Enter.
• GPT disks will have an asterisk in the far right column.

If your disk is indeed GPT, there's a problem with the installer. Otherwise, change BIOS to legacy mode to install on an MBR disk.

Try the above suggestion and let us know if it helps. For further assistance feel free to post your queries in Microsoft forums. We will be glad to assist you.

Thank You.

 

Disk management console view is not up-to-date

i dont know how to fix your disk management, but i can fix your partition problems...




open up Command Prompt with admin rights. (Right click, run as admin)


enter in
DISKPART
list disk

then find the Disk number for your Raid array... lets call it number 7 ( you can tell what disk is what by the total size)
type in

Select Disk 7
List Partition (will give you a list of all the partitions..)
Select Partition 1 (im assuming you only have 1 partition on Disk 7) repeat this step if you have more partitions.
ASSIGN


that should get the array up and running ready to use.


EDITED.

any problems, post back ^^


Still EDITING *Stick Out Tongue

side question, have you tried restarting the PC?

 

Convert GPT Disk to MBR Disk in Windows 10


Recently I met an occasion where a Win10 installation on a GPT disk needed to be converted to MBR.
I think my experience may be of some help.

The target system was Win10 Enterprise, installed on an empty 300GB HD. The layout (as reported by "diskpart") was :
Code:

Code:

 Volume ###  Ltr  Label        Fs     Type        Size     Status     Info   ----------  ---  -----------  -----  ----------  -------  ---------  --------   Volume 1     C                NTFS   Partition    297 GB  Healthy    Boot   Volume 2         Recovery     NTFS   Partition    450 MB  Healthy    Hidden   Volume 3                      FAT32  Partition     99 MB  Healthy    System

Basically I followed "OPTION ONE" of Shawn Brink (the author of the original post).
Steps 1-3 were straightforward.
After clicking "Convert GPT Disk to MBR Disk" in Step 3, a warning poped out :





Click "OK" to dismiss, then proceed to Step 4.
After clicking "Apply", another warning appeared soon :





Click "Restart Now" to proceed.
The restart triggered the conversion before loading the OS.
When the conversion was completed (in just one or two minutes), the system was restarted again.
But this time it CRASHED : some error message saying OS not found.

This is normal, because the conversion tool did not mark the system partition as "bootable".
Now :

1. Boot the target system with the Win10 installation media (DVD/USB etc).
2. Select language & click the "Next" button.
3. Click the "Repair your computer" link.
4. Click the "Troubleshoot" square.
5. Click the "Command Prompt" square.
6. At the command prompt, invoke the "diskpart" tool.
   • Locate the target partition by using the "select" and "list" commands.
   • Execute the "select partition x" command, where x is the target partition number.
   • Execute the "active" command to mark it as "bootable".
   • "exit" the "diskpart" tool.
7. "exit" the command prompt.
8. Click the "Startup Repair" square. The system will restart after the repair.
9. Done.

After the fix, the layout of the target disk looked like :
Code:

Code:

  Volume ###  Ltr  Label        Fs     Type        Size     Status     Info    ----------  ---  -----------  -----  ----------  -------  ---------  --------    Volume 1                             Partition    450 MB  Healthy    Offline    Volume 2                             Partition     99 MB  Healthy    Offline    Volume 3     C                NTFS   Partition    297 GB  Healthy    System

Finally, a couple of remarks :

• The time required for the "Startup Repair" step varies on different systems. For the 300GB disk mentioned above, it was finished in less than a minute. On another case with 1TB HD, it took nearly 3 hours of heavy disk read-write to complete the operation.
• One downside of the method is worth notice : almost all of the functions in "Advanced startup" ("Start" -> "Settings" -> "Update & security" -> "Recovery" -> "Advanced startup") were gone after the conversion.