How to Convert MBR to GPT Without Operating System

This article introduces two ways to convert MBR disks to GPT disks without an operating system, using the command prompt and the MiniTool Partition Wizard Partition Wizard.

Master boot record (MBR) and GUID partition table (GPT) are two commonly used partition styles in computer hard disks. Use the free partition manager MiniTool Partition Wizard to easily convert MBR to GPT without causing data loss. However, some users encounter "Windows cannot be installed to this disk. The selected disk has MBR partition table" error when installing Windows systems, or other reasons that require conversion without an operating system.

Fortunately, this is totally feasible. The following two methods can help you achieve your goals:

Method 1: Use MiniTool Partition Wizard

It is recommended to use MiniTool Partition Wizard to convert MBR to GPT. This partition manager accesses disks on the computer by creating bootable media and performs disk conversion. Additionally, it can convert MBR to GPT losslessly.

The paid version of MiniTool Partition Wizard has a bootable media builder built in. You can first download and install the free version, and then click the Register button to upgrade to the full version.

Step 1: Prepare a USB drive and connect it to a normal computer. Recommended USB drive size: 4GB – 64GB.

Notice:

Step 2: On the registered MiniTool Partition Wizard main interface, click the bootable media button to create a bootable USB drive.

Step 3: Insert the bootable USB drive into a computer without an operating system, and then boot from the USB drive.

Step 4: On the home page of the MiniTool Partition Wizard, right-click the MBR disk and select the Convert MBR disk to GPT disk option.

Step 5: Click the Apply button in the lower left corner.

Method 2: Use the command prompt

You can also choose to use CMD to perform MBR to GPT conversion without an operating system. The steps are as follows:

warn:

Step 1: On a normal computer, download the Windows Media Creation Tool and use it to create a bootable USB drive.

Step 2: Connect the bootable USB drive to a computer without an operating system, and press the F2 / Delete key to enter the BIOS. In the BIOS, use the arrow keys to select Start from USB drive.

Step 3: When the installation wizard appears, press the Shift F10 key combination on the keyboard to bring up the command prompt window.

Step 4: In the Command Prompt window, enter the following command. Remember to press Enter after each line of command.

• diskpart
• list disk
• select disk (please replace it with the actual MBR disk number)
• Clean
• convert gpt

After executing these commands, the MBR disk is converted to a GPT disk.

Summarize

This article summarizes two ways to convert MBR to GPT without an operating system using command prompt and MiniTool Partition Wizard. Hope the above instructions will help you complete the operation successfully.

If you have any questions about MiniTool software, please contact us.

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