How to Convert MBR to GPT Disk without Losing Data in Windows 10

Convert MBR to GPT Disk without Losing Data

This article introduces what is Gptgen in Windows 10, as well as how to use it to convert MBR disk to GPT disk without losing data step by step.

Why need Gptgen to convert MBR to GPT in Windows 10?

MBR and GPT are two different partition tables of disks. Compared with MBR, GPT has many advantages, and you may think it is necessary to convert MBR to GPT in the following situations.

1. MBR disk supports 4 primary partitions at most. If you need more partitions, you can only change one primary partition to an extended partition, which allows you to create more logical partitions on the hard drive. While GPT disk allows you to create up to 128 primary partitions.

2. MBR disk supports disk capacity up to 2TB, while GPT disk breaks out this limitation. If your 3TB hard drive only shows 2TB in Windows Disk Management, you may need to convert to GPT to use the hard drive fully.

3. When you install Windows OS on a hard drive, you may meet the problem that the “Windows cannot be installed on this disk. The selected disk has an MBR partition table.”. because on EFI systems, Windows can only be installed on GPT disks. When you meet this problem, you can convert the disk from MBR to GPT first, and then, install Windows OS.

There are many situations that need you to convert MBR to GPT. If you don't want to lose all data on the disk during the conversion, using Gptgen in Windows 10/8/7 to convert MBR disk to GPT disk should be a good method. Gptgen is a simple command-line tool for converting hard drives from the “MBR” partitioning scheme to the GPT (GUID partition table) partitioning scheme while keeping all data on the hard disk.

Steps of using Gptgen to convert MBR to GPT on Windows 10

As it mentioned, in those specific situations, you need to convert MBR partition table to GPT via Gptgen tool for the sake of data security. Here come the detailed steps to convert MBR to GPT without losing data on the disk via Gptgen.
Step 1. Download Gptgen and unpack it to any directory. Remember where you installed the Gptgen on. Here we installed on "c:\tools\gptgen-1.1". Then, run Gptgen on Windows 10 with the Administrator privileges.

Step 2. Then, run the command diskpart, under diskpart, type list disk to display all disks in the system.

Diskpart Check GPT Status

Here you can see that the Disk 0 is an MBR disk (GPT column is empty).

Step 3. Using Gptgen to convert the partition table of Disk 0 from MBR into GPT, type the syntax: gptgen.exe -w \\.\\physicaldrive0

While running this command, there appears a warning “ This tool cannot guarantee that such partitions will remain bootable after conversion.” and ask “Do you want to continue? [Y/N]”, type y and it will execute immediately.

Gptgen Convert Disk from MBR to GPT

Thus, Gptgen on Windows 10 convert MBR disk to GPT disk has been successful!

However, convert MBR to GPT with command line isn’t the simplest way, and it is difficult to operate for users who do not have enough computer knowledge. Since the operation is irreversable, it will cause data damage. Thus, here we highly recommend you the easiest way to convert MBR to GPT instead of using Gptgen Windows 10/8/7.

Alternative to Gptgen: convert MBR to GPT via GUI software

The AOMEI Partition Assistant Professional should be the best alternative to Gptgen tool in Windows 10. It is a great partition manager that can help you to manage your hard drive partitions in the best status. For example, it is able to resize partition, create partition, delete partition, wipe hard drive, secure erase SSD, etc.

What’s more, it allows you to convert MBR to GPT with GUI (graphic user interface), which is relatively easier to command line, and it supports all Windows operating systems including Windows 10/8.1/8/7/Vista/XP. AOMEI Partition Assistant can help Windows 10 convert MBR to GPT without losing data no matter you are planning to convert the data disk or system disk.

Steps of converting MBR to GPT disk with Gptgen alternative

Here is the guidance for how to convert MBR to GPT disk using Gptgen alternative - AOMEI Partition Assistant.
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First, install and launch AOMEI Partition Assistant, it will show you the main interface contains the basic situation of your disk(s). Select the MBR disk you need to convert, right click it, and select Convert to GPT Disk in the pop up menu.

Convert System Disk To GPT

Then, it will confirm if you are sure to convert MBR disk to GPT disk. Click OK.


You will back to the main interface, and you can see that the disk has already changed into GPT partition table, click Apply at the toolbar.

Apply To GPT Disk

If you are converting boot disk from MBR disk to GPT, you need to make sure if your device supports EFI/UEFI. If not, you cannot boot successfully from the disk after conversion.
To convert MBR to GPT Windows 10, using Gptgen command line is a good way. However, if you do not know it much more, the AOMEI Partition Assistant is more suitable for you. Besides, if you are working with Windows Server OS, you can upgrade to AOMEI Partition Assistant Server to manage your hard drive(s).

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