一些用于 PC 和笔记本电脑^(Laptops)的新一代主板支持 UEFI 或 统一可扩展固件接口 ^{(Unified Extensible Firmware Interface )}以及 BIOS 或 基本输入输出系统。 ^{( Basic Input Output System. )}UEFI与传统BIOS相比的主要优势在于UEFI支持容量超过 2 TB^(Terabytes)的硬盘驱动器。但是UEFI^(UEFI)的缺点是只支持 x64 版本的Windows操作系统，并且硬盘驱动器应该使用GPT结构。如果您的计算机支持并兼容UEFI并且您想从Legacy更改为UEFI，我们将在此处讨论执行此操作的不同步骤。

无需重新安装即可将Legacy 更改^{(Change Legacy)}为 UEFI

我们将讨论以下两种方法，通过这些方法我们可以将BIOS 模式^{(BIOS Mode)}从Legacy更改为 UEFI，而无需重新安装Windows 11/10-

1. ^{(Convert MBR)}使用Windows内置实用程序将 MBR 转换为GPT 。
2. ^{(Convert MBR)}使用恢复环境^{(Recovery Environment)}将 MBR 转换为GPT。

在我们继续之前，您需要满足以下先决条件 -

• 您的计算机主板应同时支持Legacy和UEFI。
• 您的计算机应该在MBR 分区上运行^{(MBR Partition)}Windows 10版本 1703 或更高版本。

请^(Please)小心，因为错误地按照说明操作可能会导致您的 PC 无法启动。

1] 使用 Windows 实用程序将 MBR 转换为 GPT^{(1] Convert MBR to GPT using Windows Utilities)}

以管理员身份运行 CMD^{(Run CMD as Administrator)} 并执行以下命令：

mbr2gpt.exe /convert /allowfullOS

等到^(Wait)该过程完成。您可以在屏幕上跟踪进度。

完成后，您需要进入 PC 的BIOS。

转到Settings > Update和Security > Advanced Startup选项。当您单击立即重新启动^(Restart)时，它将重新启动您的 PC，并为您提供所有这些高级选项。

选择Troubleshoot > Advanced 选项^(Options)。此屏幕提供更多选项，包括系统还原^{(System Restore)}、启动^(Startup)修复、返回到以前的版本、命令提示符^{(Command Prompt)}、系统映像恢复^{(System Image Recovery)}和UEFI 固件设置^{(UEFI Firmware Settings)}。

选择 UEFI 固件设置^{(Select UEFI Firmware Settings)}，它会进入BIOS。每个 OEM^{(Every OEM)}都有其实施选项的方式。

Boot Mode通常在Boot > Boot Configuration下可用。将其设置为UEFI。

保存^(Save)更改并退出。PC 现在将重新启动。

2] 使用恢复环境将 MBR 转换为 GPT^{(2] Convert MBR to GPT using the Recovery Environment)}

在运行Windows 安装程序^{(Windows Setup)}时，当屏幕上出现消息时，按 Shift+F10 打开命令提示符。

以管理员身份运行命令提示符^{(Run Command Prompt as Administrator)} 并依次执行以下命令：

mbr2gpt.exe /convert

等到该过程完成。

完成后，您需要进入 PC 的BIOS。

Boot Mode通常在Boot > Boot Configuration下可用。将其设置为UEFI。

保存^(Save)更改并退出。PC 现在将重新启动。

Trust this works for you!

How to change Legacy to UEFI without reinstalling Windows 11/10

Some new generation motherboards for PCs and Laptops bring in support for both UEFI or Unified Extensible Firmware Interface as well as BIOS or  Basic Input Output System. The main advantage of UEFI over the traditional BIOS is the fact that UEFI supports a hard drive with a capacity of more than 2 Terabytes. But the downside of UEFI is the fact that only x64 versions of the Windows operating system are supported and the hard drive is supposed to use the GPT structure. If your computer supports and is compatible with UEFI and you want to change from Legacy to UEFI, we will be discussing different steps to do that here.

Change Legacy to UEFI without reinstall

We will be discussing the following two methods by which we can change the BIOS Mode from Legacy to UEFI without reinstalling Windows 11/10-

1. Convert MBR to GPT using the Windows built-in utilities.
2. Convert MBR to GPT using the Recovery Environment.

Before we proceed further, you need to get the following prerequisites fulfilled-

• Your computer’s motherboard should support both Legacy and UEFI.
• Your computer should be running Windows 10 version 1703 or newer on an MBR Partition.

Please be careful as following the instructions wrongly could make your PC unbootable.

1] Convert MBR to GPT using Windows Utilities

Run CMD as Administrator and execute the following command:

mbr2gpt.exe /convert /allowfullOS

Wait until the process is done. You can track the progress on your screen.

When it is done, you need to go to the BIOS of your PC.

Go to Settings > Update & Security > Advanced Startup options. When you click on Restart Now, it will reboot your PC, and offer you all these advanced options.

Select Troubleshoot > Advanced Options. This screen offers further options which include System Restore, Startup repair, Go back to the previous version, Command Prompt, System Image Recovery, and UEFI Firmware Settings.

Select UEFI Firmware Settings, and it will take to the BIOS. Every OEM has their way of implementing the options.

Boot Mode is usually available under Boot > Boot Configuration. Set it to UEFI.

Save changes and exit. The PC will now reboot.

2] Convert MBR to GPT using the Recovery Environment

While running Windows Setup, when the message appears on your screen, press Shift+F10 to open the Command Prompt.

Run Command Prompt as Administrator and execute the following commands one after the other:

mbr2gpt.exe /convert

Wait until the process is complete.

When it is done, you need to go to the BIOS of your PC.

The Boot Mode is usually available under Boot > Boot Configuration. Set it to UEFI.

Save changes and exit. The PC will now reboot.

Trust this works for you!

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