GPT-Formatted Disk. Legacy Boot Not Supported [2 Solutions] This message indicates that the disk is formatted using the GUID Partition Table (GPT) scheme, which is not compatible with the Legacy Boot method. Legacy Boot is an older way of starting a computer from the BIOS, while GPT is used in conjunction with the more modern UEFI firmware. Here are two possible solutions: 1. Switch to UEFI Boot Mode: To boot from a GPT-formatted disk, your system needs to be configured to use the Unified Extensible Firmware Interface (UEFI) instead of Legacy Boot. Enter your computer's BIOS or UEFI settings (usually by pressing F2, F10, F12, or Del during startup), and change the boot mode to UEFI. Save the changes and restart your computer. 2. Create a Compatibility Support Module (CSM): Some newer UEFI systems have a feature called CSM, which allows compatibility with Legacy Boot. Enable the CSM in your UEFI settings, and this should allow you to boot from a GPT disk. However, note that this might not be recommended or supported by all systems, as it can introduce potential security risks or compatibility issues. Always consult your system's documentation before making changes. After applying one of these solutions, attempt to boot from your GPT-formatted disk again.

how to

Updated by

Linda 

Updated on April 22, 2024

If you're fed up with the error message "GPT-Formatted Disk. Legacy Boot Not Supported," worry not! This annoyance can be resolved quite easily. In this article from tools, we'll delve into the underlying issue and present you with a few straightforward solutions to get your computer back on track.

gpt-formatted-disk-legacy-boot-not-supported

The Reason for 'GPT-Formatted Disk. Legacy Boot Not Supported'

Before we proceed with resolving the issue, let's first identify the causes behind this error message.

There are two main types of file systems used to organize data on your hard drive: GPT (GUID Partition Table) and MBR (Master Boot Record). Let's examine their differences:

MBR: The Traditional Standard MBR is the older, more widely-employed system. It's what most computers were built with before the introduction of UEFI. It functions adequately but has limitations, such as only supporting hard drives up to a specific size.
GPT: The Modern Upgrade GPT is designed for newer systems and offers substantial benefits: 1. Larger Drive Support: GPT supports significantly larger hard drives, making it ideal for contemporary storage needs. 2. Increased Reliability: GPT includes redundancy features that better protect your data in case of disk issues or failures.

Here's the deal with GPT versus MBR: those sophisticated GPT disks won't function properly if your computer is still using the older 'Legacy BIOS' method for booting up. That's why you might encounter the 'GPT-Formatted Disk' error message. It's a confusing incompatibility! For a comprehensive understanding of MBR, GPT, and the difference between BIOS and UEFI, I recommend checking out these articles:

Two Solutions for 'GPT-Formatted Disk. Legacy Boot Not Supported'

There are two efficient solutions to boot your computer and resolve the irritating error of "GPT-Formatted Disk. Legacy Boot Not Supported."

 Tip: If the disk contains important data, make sure to back it up to prevent unintended data loss during the conversion process.

Solution 1. Convert GPT to MBR with Partition Master (No Data Loss)
Solution 2. Convert GPT to MBR using Diskpart (Data Loss Expected)

Solution 1. Convert GPT to MBR using Partition Master Tool (No Data Loss)

If you have a GPT disk but require an MBR system, Partition Master Professional is an invaluable tool. It enables you to change disk formats without the ominous threat of data loss. Renowned for its user-friendliness and automated functions, it aids you without the need to delve into complex manual processes.

This is the simplest way to boot your computer in Legacy BIOS mode. The best part is that it won't erase any existing data, allowing you to retain all your current disk information. To convert your GPT disk to MBR, follow these steps:

Step 1. Install and launch AOMEI Partition Assistant on your computer, and then go to the Disk Converter section.

Step 2. Choose "Convert GPT to MBR" and click "Next" to proceed.

Step 3. Choose the target GPT disk that you wish to convert to MBR and click "Convert" to initiate the conversion process.

Key Features of Partition Master:

Simple GPT to MBR Conversion: Convert GPT disks to MBR quickly and effortlessly without compromising your vital data.
Partition Management: Efficiently create, resize, merge, split, and format partitions to utilize disk space effectively.
Disk/Partition Cloning: Create exact replicas of your drives or partitions for backup or migration purposes.
OS Migration: Transfer your Windows operating system to a new HDD or SSD without the need for reinstallation.

Please feel free to share this powerful tool with other users who are experiencing the same issue.

Solution 2. Convert GPT to MBR using Diskpart (Likely Data Loss)

Another solution to convert GPT to MBR is by using the built-in Diskpart utility available in a Windows system. However, this method necessitates basic computer literacy, as a single incorrect command can result in potential data loss.

We recommend utilizing this approach only if you have prior experience with prompt commands. Otherwise, opt for the specialized tool mentioned in Solution 1.

Step 1. Ensure that you have a handy Windows installation USB. This will be your gateway to some command-line wizardry!

Step 2. Plug in the Windows installation USB to your computer and boot your computer from it.

Step 3. While you're in this special setup environment, press "Shift" + "F10" on your keyboard. This will open a Command Prompt window.

Step 4. Next, enter each of the following commands individually in the CMD window and press the "Enter" key after each one:

diskpart
list disk
select disk 1 (Replace "1" with the actual number of the disk you want to convert.
clean
convert mbr
exit

diskpart-convert-mbr

Your computer is ready to start normally.

If you encounter any issues while converting the disk from GPT to MBR using diskpart, the following page provides solutions for those problems.

Sure, please provide the text that needs to be translated.

How to Resolve Unable to Convert GPT to MBR [2024 Updated]

What steps can be taken if you're unable to convert GPT to MBR using Diskpart or Disk Management? Follow this guide to solve the problem. Read more >>

Conclusion

Encountering the "GPT-Formatted Disk" error might be confusing, but fear not – there's a solution! Converting your disk to the older MBR format should resolve compatibility issues with your Legacy system. A fantastic tool for this task is Partition Master, which offers straightforward guidance and ensures the safety of your data throughout the conversion process.

Frequently Asked Questions (FAQs) on GPT Formatted Disk Not Supported for Legacy Boot

It's entirely normal to still have a few "Wait, how does this all work?" moments even after fixing the error. Here's an explanation of some common scenarios:

1. Why is there a whole UEFI/GPT thing anyway?
Think of UEFI as the sophisticated, contemporary method for computers to boot up. GPT disks are designed for this, so older systems without UEFI simply don't know how to handle them.

It might use both! But if you have the newer UEFI setup, Windows prefers the GPT format.

3. Is NTFS similar to GPT?

NTFS refers to how your files are organized on the disk, whereas GPT is more like the addressing system for the entire hard drive.