By Michael / Last Updated March 9, 2022

What is BIOS and UEFI?

Most people may be familiar with a PC’s BIOS. Put it simply, see picture below please:

BIOS

The BIOS stands for Basic Input-Output System. When your computer starts up, it’s the BIOS’s task to activate the various components and make sure they’re functioning normally, then it passes off functionality to your operating system or another boot loader.

The Unified Extensible Firmware Interface, UEFI for short, can be said an updated version of the old BIOS.  Compared with Legacy, UEFI has many advantages. For example, it avoids Legacy Option ROM address constraints and supports OS boot partitions more than TB.

Moreover, based on the news from Microsoft office, the Windows 11 system only runs on UEFI motherboard if you use the "Check for Update" feature to upgrade Windows 10 to Windows 11.

legacy to uefi

How to convert BIOS to UEFI correctly?

We’ve learnt you can gain many benefits by upgrading BIOS to UEFI. Then, how can we upgrade successfully? Read on and do as follows.

1. Reboot your PC and once you see a message like "Press * to Enter Setup", press the corresponding key to enter BIOS.

2. Go to the “Boot” tab.

3. Change Legacy to UEFI as the screenshot above shows.

Convert MBR to GPT without losing data

After you have upgraded BIOS to UEFI, you can convert MBR disk to GPT and reinstall Windows operating system, and so on. Specific situation refers to the table below:

Operating System

Data Access

System Boot

Windows XP 32-bit

Not Support GPT

Not Support GPT

Windows XP 64-bit

Support GPT

Not Support GPT

Windows Vista 32-bit

Support GPT

Not Support GPT

Windows Vista 64-bit

Support GPT

Support GPT(Need UEFI)

Windows 7 32-bit

Support GPT

Not Support GPT

Windows 7 64-bit

Support GPT

Support GPT(Need UEFI)

Windows 8 32-bit

Support GPT

Not Support GPT

Windows 8 64-bit

Support GPT

Support GPT(Need UEFI)

About converting MBR to GPT, I recommend you use AOMEI Partition Assistant Professional, which is a highly-efficient, easy-to-use, and multifunction partition management software, with user friendly operations to assist you manage the partitions of your hard drives.

With the help of Partition Assistant, you can not only convert between MBR and GPT in only a few clicks, but also, easily & fast create/delete and merge/split the partition and the biggest advantage is that it resizes/moves your partition to readjust the partition volume on the basis that it ensures the security of your data.

Download Demo Win 11/10/8.1/8/7/XP
Secure Download

Step 1. Install and launch the software, right-click the MBR disk you want to change, and then choose Convert to GPT Disk.

Convert Data Disk to GPT

Step 2. In the pop-up windows, click OK to continue.

OK to GPT Data Disk

Step 3. Click Apply to operate and then your disk will be changed into GPT disk style.

Apply to GPT Data Disk

Conclusion

 

What’re BIOS and UEFI and can I upgrade BIOS to UEFI. At the beginning of the post, the definitions of these 2 different systems are given and meanwhile, the detailed steps to convert BIOS to UEFI are listed. In the final part of the article, you’ve learnt how to convert MBR to GPT with a third-party software utility AOMEI Partition Assistant Professional which helps finish the conversion in only 3 steps. The Pro edition of the AOMEI product is supported by Windows 11/10/8/8.1/7 XP and if you want to use it on Servers, please try the Server edition.