Windows 10: Getting my boot drive into GPT

Hi, I'm trying to enable secure boot, I have windows installed on my nvme drive, its listed as disk 3 in disk mangement. I have done the shift and restart, but there is no option for a uefi settings there in the troubleshoot menu. I have gone into bios and tried to boot as uefi, but that didnt work, I have gone into command prompt and done the mbr2gpt /allowfullos /disk:3 /convert which didnt work and tried reagentc in command prompt, and again, just getting errors, I've done a full clean windows install, I now am unsure what else i can do, can I format the drive and then initialise into gpt?

:)

 

Upgrading to a GPT boot drive

Hi everyone;

I've spent about 20 hours on forums all over the internet trying to find out how to do this, I've tried loads of different utilities, and so far nothing has worked.

I have Windows10 Education installed on a 1TB HDD, booting in legacy mode (MBR). It's out of space, and I need to move it to my new 3TB HDD, which needs to be UEFI & GPT. I have a UEFI bootable USB with Win10 Education ISO on, created using Rufus. I have
another UEFI bootable USB With Ubuntu on (someome suggested installing Win10 on the new drive, then reconnecting the old drive and using the ubuntu USB to run NTFSCLONE to clone the old drive to the new drive. It nearly worked; all the files etc were on the
new drive, but when I tried to boot it would hang after the windows 10 splash logo; with just the dots circling.

currently the new drive has windows 10 installed, It works, it's UEFI bootable, although the partitions aren't in the recommended order (EFI is third not 1st, is this an issue?!) & under boot menu it shows up twice: once as Windows Boot Manager & once just
the drive; the old drive is exactly as it was before I started

I can't afford to buy any expensive utilities, I can't afford to buy an external HDD to store an image on, is there any way I can do this??

Im fairly technologically competent but I've not done anything like this before so step by step instructions please!

thank you

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GPT disk conversion for both data drives and C drive


Macrium Rescue disk can be used to convert from MBR to GPT and vice versa without doing a fresh install of Windows.

1. Download Rescue6.1.1081X64.iso - Google Drive and use Rufus to create a bootable USB disk. Skip this step if you've already created the Macrium Rescue disk.
2. Download: BootEFI_Only-00-00.zip - Google Drive . Unzip to an external or an internal HD
   NOTE: This is a copy of the first 3 partitions of my current Windows 10 x64 (450MB Recovery, 100MB EFI and 16MB MSR)
3. Boot up Macrium Rescue disk and create a backup of your current Windows to another internal/external HD. It serves 2 purposes: you'd have a backup of your current Windows in case things go wrong and then use it to restore the C drive on the next steps.
4. Next, switch the BIOS to UEFI and use Macrium to restore the first 3 partitions downloaded in step 2 to your current MBR Windows. No need to convert or Format, Macrium will do it.
5. Again with Macrium, select the backup image from step 3, and copy back the C drive after the 3 partitions.
   After this step, you should have: 450MB, 100MB, 16MB and C drive (GPT partition scheme)
6. From Macrium, click on Fix the Windows Boot Problems
7. Reboot. Your Windows should be in UEFI mode.

 

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.