Why My Computer No Longer Boots After Converting from MBR to GPT?

When I wanted to format my Windows 7 with Windows 10, it prompted a message saying, 'Windows cannot be installed on this disk. The selected disk has an MBR partition table.' I changed all partitions to GPT. I'm unfamiliar with this issue, and I would appreciate the help.

Best Answered by

Roxanne· Answered on Jul 31, 2023

In response to your question, we will explain why your computer no longer boots after converting from MBR to GPT. GPT and Legacy modes are mutually exclusive choices. In other words, you cannot have GPT partitions but have Legacy BIOS implied. There are two choices: one is to convert the GPT disk to MBR, and another one is to enable the UEFI mode on your computer. This article will give you a full tutorial on the two solutions. Continue to read and learn.

Method 1. Convert GPT disk to MBR

EaseUS Partition Master is a powerful disk conversion tool that can help you convert the disk from GPT to MBR without effort. Moreover, it's safer than Disk Management and Diskpart since EaseUS Partition Master would not delete your partitions.

Free Download 

Windows 11/10/8/7100% Secure

Follow the easy steps to convert GPT to MBR using EaseUS Partition Master:

Step 1. Download and open EaseUS Partition Master.

Step 2. Find the "Convert GPT to MBR" button under the "Disk Converter" tool and click "Next."

Step 3. Select the target GPT disk and click "Convert" to start the conversion.

After converting, you can check if the system disk successfully becomes GPT.

Related Article: How to Tell If Windows Is GPT or MBR

Method 2. Enable the UEFI boot mode

Since the GPT disk can create more than 2 TB, you can keep the GPT partition style and change the boot mode to UEFI.

Here is how to do so:

Step 1. Restart the computer before long-press the F2 key.

Step 2. Find the "Boot or System Configuration" unit and click "Boot."

Step 3. Go to "Boot," press "Enter," choose "UEFI/BIOS Boot Mode," and press "Enter."

Step 4. Choose UEFI mode, press "Enter," and Press F10 to enable and exit the screen.

Remember to restart the computer to boot from the UEFI boot mode.

People Also Ask

Unable to Create Partitions Because the Disk Already Contains the Maximum Numbers of Partitions

Have you ever encountered the error message: the disk already contains the maximum number of partitions? If you are having a hard time with this problem, you should read this article that contains a solid way to fix it.

Roxanne

Aug 09, 2023

Should I Convert My Secondary HDD from MBR to GPT? How to Do?

If you are struggling with the partition question: should I convert my secondary HDD from MBR to GPT? As well as wanting to learn how to do disk conversion, watch this article and find the answers.

Roxanne

Jul 31, 2023

MBR2GPT Cannot Find Room for the EFI System Partition Error, How to Fix?

You may meet the 'cannot find room for the EFI system partition' error when you upgrade legacy BIOS to UEFI using the MBR2GPT utility.

Roxanne

Oct 19, 2023

Is There Any Way to Change Legacy BIOS to UEFI BIOS?

This article will offer a solid way to help users convert MBR to GPT and change Legacy BIOS to UEFI BIOS on the computer. Read and find more details.

Roxanne

Jul 31, 2023

Is It Possible to Convert BitLocker Encrypted GPT Drive to MBR?

You may be curious about the question: is it possible to convert Bitlocker encrypted GPT drive to MBR? This post will answer you and provide solid ways to help you do that.

Roxanne

Jul 31, 2023

Diskpart Is showing One Partition as Two Different Ones, How Can I Do?

Are you experiencing this situation: diskpart shows one partition as two different ones when you want to convert MBR to GPT? This article will discuss how to fix the problem and convert MBR to GPT by offering a complete guide.

Roxanne

Jul 31, 2023