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Posted: **23 Mar 2023, 08:16**

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How to Convert MBR to GPT on Windows 10

In this tutorial, you'll learn how to convert your disk from MBR (Master Boot Record) to GPT (GUID Partition Table) on a Windows 10 computer.

GPT offers several advantages over MBR, such as support for larger disk sizes and improved data integrity.

Note:

Please note that converting partition types can be risky, so make sure to backup your important data before proceeding.

Step 1: Open Command Prompt as Administrator
1. Press the Windows key on your keyboard to open the Start menu.
2. Type "cmd" to search for the Command Prompt.
3. Right-click on the Command Prompt and select "Run as administrator."

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Step 2: Validate the Conversion
1. In the Command Prompt, type the following command and press Enter:

Code: Select all

mbr2gpt /validate /allowFullOS

This command will perform a validation to check if your system can be converted without issues.

Step 3: Convert MBR to GPT
1. If the validation is successful, run the following command to start the conversion process:

Code: Select all

mbr2gpt /convert /allowFullOS

2. Once the conversion is complete, close the Command Prompt and restart your computer.

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Step 4: Access BIOS/UEFI Settings
1. During the startup process, press the specific key to enter the BIOS/UEFI settings.
The key may vary depending on your computer's make and model (e.g., F2, F10, or Del).

Step 5: Change Boot Mode
1. In the BIOS/UEFI settings, locate the boot mode options.
2. Change the boot mode from Legacy/BIOS to UEFI.
3. Save the settings and exit.

Conclusion:
Your system will now boot using GPT and UEFI. This may improve your boot times, but the overall difference may not be significant.

If you continue to experience slow boot times, consider investigating other potential causes, such as software or hardware issues check out our guide on this: A Guide to Diagnosing a Slow Windows PC.