Windows 10: Bootmanager not found on MBR Partition, bootable Stick not working

I was setting up a TrueNas and wondered why I couldn't make it appear in my Networkdevices, I had no problem reaching it per my phone. I then tried to update to win 11, getting a problem bc somehow secure boot was missing. I tried enabling it, but couldn't make it work. Somewhere along the line I discovered that my Win10 was on a MBR-Partition. Trying to switch it to GPT I found that the MBR2GPT-Tool didn't work, maybe bc I had four partitions on the Disk Windows, Data, System, Recovery. I cloned Recovery on another Disk and deleted it. It didn't work after that and someway down the line, m

:)

 

clone MBR HD to bootable GPT partition?

Hi,

1. You cannot convert mbr to gpt without data loss. otherwise, you can follow directions here:

FROM WINDOWS RECOVERY CONSOLE:

To change a master boot record disk into a GUID partition table disk using a command line

• 
  Back up or move the data on the basic master boot record (MBR) disk you want to convert into a GUID partition table (GPT) disk.
  
• 
  Open an elevated command prompt (right-click Command Prompt, and then click Run as Administrator) and type diskpart. If the disk does not contain any partitions or volumes, skip to step 6.
  
• 
  At the DISKPART prompt, type list disk. Make note of the disk number you want to convert.
  
• 
  At the DISKPART prompt, type select disk <disknumber>.
  
• 
  At the DISKPART prompt, type clean.
  

2. I'd suggest converting your vista drive to a virtual machine, load that up on your windows 10 system and use a program like virtualbox to run it.

 

clone MBR HD to bootable GPT partition?

My HP Vista laptop took a swim and died. I pulled the 320MB HD, put it in an external enclosure and found it still good. Bought a new Dell Win 10 machine w/ 1TB HD. Plan was to:

• 
  Partition off a piece of the new 1TB w/ native Win10 Disk Management.
  
• 
  Clone the 320MB Vista drive into the new partition w/ Easeus Partition Manager.
  
• 
  Run Paragon-adaptive-restore on the Vista partition.
  
• 
  Set up as dual-boot Win10 / Vista.
  

Ran into problems right away. Apparently can't clone the MBR HD to a GPT partition and have it remain bootable. Don't see a way to do this without wiping the new Dell 1TB clean – which I'm hesitant to do, especially since I'm about 6000 miles from
home right now.

• 
  What's the solution to cloning the MBR drive to a bootable GPT partition?
  
• 
  Am I on the right track? I really want to preserve this Vista installation - I have 30+ years of data in legacy programs on it that would be very difficult to access in Win10.
  

TIA

 

clone MBR HD to bootable GPT partition?

I think in 1.) you're giving me details on how to wipe out my Win10 drive, which doesn't help.

It sounds like I CAN clone a bootable MBR into a GPT drive partition if I start off with a completely empty drive. So if I go buy a fresh 1TB drive and clone the MBR drive into it first (partitioning as GPT) then I'll be able to clone the Win10 into it
and have a dual-bootable system?

I'm also intrigued by your 2.) answer although it was short on details. I'll go search about "virtual machines" and see if I can get there that way.