AOMEI Partition Assistant
How to MergePartitions in Windows 11 [3 Free Ways]
Do you have any idea about how to merge combine partitions in Windows 11? You can find answer from this article.
By Roxanne / Updated on May 19, 2025
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In this tutorial, you can merge 2 partitions in Windows 11 without losing data, including using the partition merging tool - AOMEI Partition Assistant and merge partitions using CMD and Disk Management.
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This complete guide is also suitable for merging non-adjacent partitions in Windows 10 and Windows 7.
Why merge/combine partitions in Windows 11?
Merge or combine partitions refers to combining two partitions into one partition or combining one partition with an unallocated space. Merge partitions are very useful for our daily management of Windows PC. Here is a typical case from Microsoft Community:
"How do I combine partitions into one partition, without losing my data? On occasion I have tried to copy files to a MSFT standard folder but get an error there is not space. So I would like to combine the folders into one partition, there by using the full available capacity of the disk.“
Generally, people want to merge partitions for the following reasons:
✦ When C drive is full and D drive is empty, merge partitions can help extend the C drive space.
✦ Merge two small partitions into one larger partition.
✦ Reduce the number of partitions, which is convenient to manage.
How to merge partitions in Windows 11 without losing data
Here, I will show you how to merge partitions in Windows 11 in 3 different options. One is to merge partitions through Windows 11 Disk Management, CMD and the rest is trying another alternative software.
| 🚀AOMEI Partition Assistant | Third-party software, merge partitions without data loss |
| 🔒Disk Management | Built-in tool of Windows, but merging partitions causes data loss |
| 💡Command Prompt | This require experienced computer knowledge and skills. |
Among other things, AOMEI Partition Assistant allows you to merge two non-adjacent partitions. It has greater compatibility and the ability to break through the limitations of Windows built-in tools. If you are new to this tool, it is highly recommended that you try it first.
▶ Option 1. Merge (combine) partitions in Windows 11 by alternative software
AOMEI Partition Assistant is one of the most popular disk management tools on the market. It aims to help users solve various complicated disk problems with the simplest steps. It supports merging two adjacent partitions or non-adjacent unallocated space without deleting partitions.
What’s more, it also has more features that are popular with users, such as Resize Partition, Create Partition and more. Please download this software to see how to merge combine partitions in Windows 11/10/8/7.
100% SecureNote: You can also extend C drive by Allocate Free Space feature, which enable increase C drive space from D drive without merging partitions.
Step 1. Install and run it. Right-click the partition you need to merge, select "Advanced" and choose "Merge Partitions".
Step 2. Then, choose the partition that you need to be merged and click OK.
Step 3. After that, click "Apply" and "Proceed" to generate the final operations.
- ★Tips:
- Merge Partitions can only merge two partitions at a time. However, two or more unallocated spaces can be merged at the same time, and the unallocated spaces do not need to be adjacent.
- You can merge data partition into system partition, but you cannot merge system partition into data partition.
- If you want to complete these operations in Windows Server, please upgrade to AOMEI Partition Assistant Server.
100% Secure▶ Option 2. Merge partitions in Windows 11 with Disk Management
Windows Disk Management can help you merge 2 partitions through Extend Volume option, but Extend Volume will be grayed out when there is no unallocated space or the unallocated space isn’t adjacent to the target drive. If to extend the C drive, you should delete the D drive to get an unallocated space.
Step 1. Open Disk Management in Windows 11 first.
Press "Windows + R", type in "diskmgmt.msc" and hit "Enter" to open Disk Management
Step 2. Next, you should delete one partition to generate unallocated space.
If you need to combine C drive, you should right-click D and select “Delete Volume”.
Step 3. Then, extend the target partition with the unallocated space.
Right-click the C drive and select the "Extend Volume".
Step 4. Follow the Extend Volume Wizard to complete extend C drive.
Here, click "Next" and accept the default options to merge two partitions in Windows 11.
Warning:
① The D drive will be deleted forever. If there are important data, please back up in advance.
② The unallocated space must be adjacent to and on the right side of the C drive. Otherwise, Disk Management does not allow you to extend the C drive with the deleted D drive.
Did you see it? Disk Management can merge partitions only when adjacent partitions are deleted. If you want to merge partitions without losing partition, then I highly recommend you to use an alternative software.
100% Secure▶Option 3. Merge Partitions Windows 11 Using CMD
If you are familiar with computer operations, you can use diskpart to merge partitions. Depending on the command parameters, you can perform partition deletions, format drives, etc.
Step 1. Open the start menu and type diskpart.exe to enter a command prompt window.
Step 2. Type the following commands to merge the partitions and press Enter after each command.
- list volume
- select volume
- delete volume
- extend
The process is similar to disk management but lacks the visualization component. And the method is technically demanding. For a safe and efficient partition merging experience, it is recommended that you choose AOMEI Partition Assistant to perform the automated process.
100% SecureFurther reading: How to recover lost data when merging 2 partitions?
If you choose not to use third-party software to merge partitions, it's important to be cautious, as there is a higher risk of data loss. This can happen if the process involves formatting a partition, if it is interrupted by a system crash or power failure, or if the file systems involved are incompatible and the tool cannot handle the conversion properly. But don't worry, AOMEI Partition Assistant also offers this function to help you recover any lost data. All you need is to install its Professional version.
It can recover over 1,000 types of files—including photos, videos, and documents—from hard drives, SSDs, USBs, and other storage devices. Its deep scan detects files that other tools might miss, and you can preview them before recovery. With the powerful tool, you can easily merge partitions in Windows 11 without data loss, even if you're not using other third-party software.
Step 1. Install and launch AOMEI Partition Assistant Professional. Click on "Recover" from the top menu, then select "Recover Data".
Step 2. Choose the USB drive that contains the lost files and click "Start Scan".
Step 3. After the scanning process is complete, a list of all deleted files will be displayed. Tick the checkboxes next to the lost files you want to recover, then click "Recover".
Step 4. Select a destination path to save the recovered files.
Step 5. Once the recovery process is finished, navigate to the chosen path to locate and access your recovered files.
Conclusion
This is the full guide on how to merge or combine partitions in Windows 11 without losing data. If there is an adjacent unallocated space behind the target partition, Disk Management is enough. But if there is no unallocated space behind the target partition, AOMEI Partition Assistant must be the best choice. In addition, you can also create a portable partition manager that can solve disk partition problems anytime.
