Possible to convert gpt to mbr without losing data?

Attempting to convert GPT to MBR without losing data is definitely a bit of a gamble. Even with reputable third-party tools claiming to do it safely, there's always a risk. You might run into unexpected errors, corrupted partitions, or even total data loss if something goes wrong.

I've seen folks try these conversions with tools like MiniT1, and most of the time, it works fine if everything is straightforward — like a simple disk with no tricky partition setups. But if your disk has complex partitions or specific boot configurations, things can get messy. Sometimes, the process fails midway, and that can be disastrous.

Always, always, backup your data before converting GPT to MBR — like, clone the entire disk or copy everything to an external drive. It’s the safety net that turns a potential disaster into a minor inconvenience.  If you're dead set on doing this, do it carefully, use a reliable tool, and have a backup ready. Even then, be aware that there's no 100% guarantee it won't go sideways.

If you're nervous, the safest bet is to do a clean install of Windows on a properly formatted MBR disk and restore your data afterward. It’s more work, but it’s a sure way to avoid any surprises.