How To Change BIOS Mode from Legacy to UEFI

Switching from Legacy boot to UEFI boot requires understanding the differences between MBR and GPT disk partition styles. Legacy boot uses MBR, while UEFI boot uses GPT. This guide will walk you through the process of converting your disk and configuring your BIOS settings.

Step 1: Understanding the Basics

Legacy boot requires Windows to boot from an MBR disk, while UEFI boot requires a GPT disk. Hence, when switching from Legacy to UEFI, it's essential to convert your disk from MBR to GPT.

For a detailed guide, refer to our articles:

Step 2: Enabling UEFI Mode

The steps to enable UEFI mode vary depending on the computer. In this example, I'll demonstrate using an Asus ROG Strix Motherboard, but the steps should be similar on other devices.

  • Restart Your Computer: Begin by restarting your computer and entering the BIOS setup.
  • Entering BIOS/UEFI Setup: If you're unsure which key to press to enter the BIOS or UEFI Setup menu, our article on "How To Enter BIOS or UEFI by Manufacturer" can help.
  • Switch to Advanced Mode: In the BIOS/UEFI Setup menu, if you're in easy mode, switch to advanced mode. On an Asus ROG Strix Motherboard, press F7.

Configure Boot Mode:

  • Navigate to the Boot tab.
  • Look for boot mode or Compatibility Support Module (CSM).
  • Ensure that Boot mode is set to UEFI or CSM is disabled.

If you have a newer motherboard, you may be able to enable CSM and choose the boot device control to be Legacy only, UEFI only, or both.

Save Changes and Exit:

  • Navigate to the Exit tab.
  • Click "Save Changes and Reset" or press F10 to save the changes and restart your computer.

Following these steps will help you successfully switch from Legacy boot to UEFI boot, ensuring your system is set up correctly for improved performance and security.

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