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How to Convert Windows 10 MBR to GPT without Data Loss

About MBR and GPT

Before delving into the process of converting Windows 10 MBR to GPT disks, it is necessary to understand the basics of MBR and GPT disks.

The maximum allowed partition size for the Master Boot Record (MBR) is 2 terabytes (TB), with a choice of 4 primary partitions or 3 primary partitions plus 1 extended partition. A workaround to overcome the 4 partition limit on an MBR disk is to create up to 3 primary partitions and then create an extended partition, allowing multiple subpartitions (often called logical drives) to be created.

Convert Windows 10 MBR to GPT

On the other hand, GUID Partition Table (GPT) has no theoretical limits on the number of partitions and disk size, providing a more flexible structure. GPT system disks require a UEFI (Unified Extensible Firmware Interface)-enabled system to boot. Therefore, only users with UEFI-capable motherboards can take advantage of GPT to create an unlimited number of partitions and take full advantage of the power of larger hard drives. However, it is worth noting that the GPT structure does not apply to removable media such as USB memory sticks, CDs, DVDs, etc.


Why need to convert MBR to GPT?

The choice between MBR and GPT structures in Windows 10 often confuses users. The MBR configuration limits disk size to 2 TB, causing the drive's unallocated space to exceed this threshold, rendering it inaccessible. To fully utilize the potential of an expandable hard drive, converting Windows 10 MBR to GPT without data loss is imperative. Additionally, for those looking to upgrade from Windows 10 to Windows 11, choosing GPT is non-negotiable as Windows 11 only boots in UEFI mode.

It is important to realize that the Windows XP 32-bit, Windows 2003 32-bit, Windows 2000, and Windows NT4 operating systems lack support for GPT disks. Attempting to use GPT in these systems will result in a "GPT protected" partition being displayed, restricting access to the data until the conversion from GPT to MBR is performed.

By convention, using GPT or MBR partition structures has its advantages and disadvantages. Modern users navigate between these structures based on the current situation and their specific hardware prerequisites. Dynamic interchangeability remains a practical way for users to adapt their choices to evolving technology and system requirements.

How to convert MBR to GPT in Windows 10?

For safe and seamless disk conversion between MBR and GPT, AOMEI Partition Assistant Professional stands out as the recommended solution. This powerful Windows partition manager is capable of converting system and data disks to GPT or MBR without affecting existing partitions on the target disk.

It is worth noting that this powerful tool allows users to directly convert the system disk in the Windows environment without entering the WinPE environment, as long as the system starts successfully. One noteworthy feature of AOMEI Partition Assistant is that it uses a user-friendly way to convert MBR to GPT in Windows 10 without data loss.

Let’s explore the outstanding features of AOMEI Partition Assistant:

  • With its modern and user-friendly graphical interface, converting MBR disk to GPT in Windows 10 becomes a seamless task that can be completed in just a few clicks.
  • This versatile tool extends its compatibility beyond Windows 10, ensuring users operating on Windows 7, 8, 8.1, and 11 to easily convert disk partition style to GPT without data loss.
  • In addition to system MBR disks, AOMEI Partition Assistant also allows users to convert external MBR hard drives to GPT without deleting partitions, thus enhancing the flexibility of disk management.
  • If you accidentally converted the wrong disk to GPT, this tool provides a practical solution - enabling users to easily restore GPT disk to MBR.

If you want to convert Windows 10 MBR to GPT, here is a simple guide you can refer to:

Step 1. Install it, and launch the program. In the main window, you should right-click on the disk that you want to convert and choose the "Convert to MBR" option.


Step 2. Click "OK" to continue.


Step 3. Click "Apply" to perform the pending operations.



The urgent task of converting Windows 10 MBR disk to GPT offers significant advantages, including optimizing disk space, extending partition possibilities, correcting installation failures, and facilitating a smooth transition to Windows 11. If you choose a reliable MBR2GPT utility like AOMEI Partition Assistant Professional, you will enjoy a smooth process of conversion from MBR to GPT. Besides, this is also a disk cloning tool helping you to clone HDD to SSD free.