How to change or convert mbr to gpt without data loss?

Using Windows Setup to change MBR to GPT involves booting your computer from a Windows installation media (like a USB or DVD) and using the tools available during the installation process to erase and reformat the disk. Essentially, this method is suitable when you're installing or reinstalling Windows, and it allows you to change the disk to GPT as part of the setup process.

Here's a simplified overview of how it works:

1. Prepare and boot from Windows installation media: You insert a bootable Windows USB or DVD and restart your computer. You might need to change the boot order in your BIOS/UEFI settings so that the computer boots from the installation media.
2. Start Windows installation process: Once booted, follow the prompts to start installing Windows. When asked where to install Windows, you'll see your drives and partitions.
3. Access Command Prompt: At this point, you press Shift + F10 to open a Command Prompt window. This allows you to run disk management commands directly.
4. Use disk partitioning tools: In Command Prompt, you run the diskpart utility. You list available disks, select the one you want to convert, then delete all existing partitions with the clean command. This effectively erases everything on the disk.
5. Change MBR to GPT: After cleaning the disk, you run the convert gpt command within diskpart. This changes the disk's partition style from MBR to GPT.
6. Proceed with Windows installation: Once the disk is converted, you close the Command Prompt and continue installing Windows on the unallocated space. Your system now uses a GPT disk, and if your BIOS/UEFI settings support it, Windows will install in UEFI mode.