Windows 10: Unable to Convert Windows 10 LTSB Build 14393 from MBR to GPT

Hello,

I am having some issues trying to convert a disk from MBRto GPT by using the following command in Admin Powershell “mbr2gpt.exe /convert/AllowfullOS”. My company has introduced a new image called Windows LTSB Build14393 that we are wanting to use as our “base image”, since this particularbuild strips away all the “Extra” stuff such as edge, Microsoft store, etc etc.
Anyways, the problem I am running into is the followingcommand:
“mbr2gpt.exe /convert /AllowfullOS”
It states that the following file isn’t specified. Afterdoing some research online, I found a post on Microsoft’s website that statesthe following command is only compatible in builds 1703 or higher. The reasonbehind us needing to convert the disk from MBR to GPT is so UEFI can be turnedon while the drive is encrypted with bitlocker. Otherwise every time you rebootor make a simple change in the BIOS, bitlocker is going to prompt for therecovery key…
Is there some type of third party tool that can be used toconvert a disk to GPT? Or perhaps some type of “Work Around”?
Any help at this point would be greatly appreciated!


:)

 

3TB Drive format windows 10 not working

This is because your hard disk is MBR disk, you can check it in Disk Management.
which only supports 2 TB drive. so the only way to get your space backup is to convert your disk back to GPT disk. Disk management can only convert a disk to MBR when it is empty. Therefore, you need a third party software to

convert MBR to GPT on Windows 10 without affecting the OS, such as AOMEI Partition Assistant.after installing this software, the Convert mBR/GPT wizard will guide you through the process. http://www.disk-partition.com/help/convert-gpt-mbr-disk.html

 

Need to install windows 7 professional after a month

You can go to bios to check boot mode. if it is Legacy mode, then convert
disk to MBR partition table. if it is EFI or UEFI mode, then convert the disk to GPT disk. you can also change the boot mode to fix this.

The conversion with Windows built in tool will delete everything on your disk including recovery partition.You can use diskpart.exe or disk management to convert GPT to MBR, but you need to delete this disk to make it shown
as unallocated space. therefore, you'd better backup the needed information before doing it.

If you want to convert between GPT and MBR without affecting the OS, you need to use third party software, such as AOMEI Partition Assistant. http://www.disk-partition.com/windows-10/convert-mbr-gpt-windows-10-0528.html

 

You can do this with Macrium Reflect, but I'm not sure it will be what you're looking for. Check out this Macrium article "Convert an MBR disk to a GPT disk," and see if it might work for your needs.
HTH,
--Ed--

 

Ed's suggestion is probably the best, since you get (and probably have) system image.

Other solution is to use Minitool partition wizard, but Pro version is required for converting system disk. Did you consider using WinPE environment? Not sure about possible bitlocker problems using newer Windows environemet.
Check this Minitool page

 

AndreTen,

Yes, I moved the mbr2gpt installer to a WinPE environment and tried to run the installer that way... It said it completed successfully but still couldn't boot to the hard disk when UEFI was turned on. I'll try Ed's suggestion to see if that helps.

 

I see an issue may be that the LTSB is an Enterprise edition of Win10.
Quoted from Windows 10 editions - Wikipedia

The Build number 14393 suggests the Version is 1607, we now have Versions 1703 and 1709 with 1809 probably later this year. Version numbering is Year and Month of release.

 

The Macrium page to which I linked in my earlier post also provides instructions. One way or another, we'll help you get it sorted!
--Ed--

 

You'll get no advantage from doing this.

If you change BIOS setting you will be prompted for a recovery key exactly the same if you are booting in UEFI or legacy mode (I run bitlocker on both types of system). This is the point of bitlocker - to stop unauthorized changes to the boot process and it works exactly the same with legacy and UEFI.

If you want to make a change to a BIOS setting then the correct procedure is to suspend bitlocker, reboot, make your change and then once you get back to desktop bitlocker is re-enabled.

Suspend or Resume BitLocker Protection for Drive in Windows 10 Windows 10 Tutorials