Windows 10: Can't reinstall windows on laptop due to non GPT drive

Hey guys so I'm not very experienced in much on computers but I've reinstalled windows a few times.

My problem is that I have created a flash USB with media creation tool and I booted into setup, my laptop only has 1 drive with everything on and when I was selecting partitions I deleted the drive and made it new again. This means that it wiped all the data so I could no longer boot into my old system if I wanted to.

When I was about to click next with the drive selected, it said I couldn't select the drive because I needed a GPT partition style. I tried to boot back into my old windows but it took me to a screen where it prompted to use a flash drive or recover mode, I tried to use recovery but nothing happened, I tried to look it up online but you can only do it in windows UI.

If there is a really complicated fix please explain it in detail because I'm not very good with computers. Thanks.

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:)

 

GPT drive

I just upgraded my computer from Windows 7 to Windows 10. I have software installed on an SSD and data on a 4TB second hard drive. Somehow, in the upgrade, my data drive turned in to a GPT Protective Partition. I would like to return it to a Primary Partition
without losing the terabytes of data on it. Any suggestions?

 

Cannot convert GPT to MBR.

Hi Michael,



I suggest you to follow the below steps and check if it helps.

This method you have to backup all your data and delete all partitions and volumes. Then use the
DISKPART command.

• Open command prompt and type in DISKPART and press Enter
• Then type in list disk (Note down the number of disk you want to convert to GPT)
• Then type in select disk number of disk
• Finally type in convert gpt.

Hope the information helps. Do reply if you need further assistance.

 

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.