[2 Ways] How to Merge Partitions on Windows 10 Easily

Merge partitions on Windows 10 can save "low disk space" problem. In this page, you are going to learn how to merge 2 partitions into 1 larger partition without losing data.


By Emily / Updated on June 3, 2024

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Why merge partitions on Windows 10 or Windows 11?

Merging partitions refers to merge two partitions into one partition or combine a partition with unallocated space on hard drive to extend the space of a partition. 

For example, if your C drive full but D empty, you can merge C with D to extend the space of C drive. Moreover, if there are too many partitions on hard drive, it is inconvenient to manage them; if you store different data on so many different partitions, when you want to open one of them; you may forget where the data are saved. So combing two partitions can help reduce the partition number.

C Drive Full

How to merge partitions on Windows 10 with Disk Management

Windows 10 Disk Management can help you merge partitions, but it is only available when there is contiguous unallocated space behind the partition you would like to extend. Or, the "Extend Volume" option will be grayed out.

1. Open Disk Management. (You can type "diskmgmt.msc" in the Run window, or right-click on This PC and then select Manage >Computer Management > Storage > Disk Management.)

2. Locate the two partitions you want to merge and then delete one partition. For example, to combine C: drive and D: drive, you should delete D: drive. Right-click on D: partition and select "Delete Volume".

Tip: Be aware that all data stored on D: drive will be lost. You'd better create a backup before doing it.

Delete Volume

3. Next, right-click on the system partition and select the "Extend Volume" option.


4. Follow the Extend Volume wizard and accept the default options to merge two partitions in Windows 10.

Extend Volume Wizard

As you can see, this function is only available when the unallocated space is adjacent to the partition you want to operate. You are not allowed to combine two partitions directly or merge partition with a non-contiguous unallocated space.

[Data Safe] Alternative to merge partitions on Windows 10

If you want to merge partitions on Windows 10 without losing data, you can try a reliable partition manager – AOMEI Partition Assistant.

It supports adding non-adjacent unallocated space into one partition or combining two partitions easily without deleting it. Free download it and check out the following guide about how to merge partitions on Windows 10 or Windows 11 without data loss.

Free DownloadWin 11/10/8.1/8/7
Secure Download

1. Install and run it. Right click the partition you need to merge (e.g. Partition D) and choose Advanced > Merge Partitions.


2. Choose the partition that you need to be merged (eg. Partition E) and click OK.


3. In the main interface, after confirming operation, click Apply and Proceed to commit it.


Only 2 partitions can be merged at one time, and the two partitions must be adjacent, but merge two or more parts of unallocated space into a partition is available and no matter the unallocated is next to the partition you want to merge or not.
You can merge data partition into system boot drive, but you cannot merge system boot drive into data partition.
If you want to combine two partitions in Windows Server, you can try the AOMEI Partition Assistant Server.


Now, surely you have realized how to merge partitions in Windows 10/11. If there is an adjacent unallocated space behind the partition you want to extend. You can combine the partition with the unallocated space within Disk Management. If there is no such unallocated space and you want to merge two partitions like C drive and D drive without data loss, it is recommended to apply AOMEI Partition Assistant Standard.

Apart from merging two drives, AOMEI Partition Assistant Standard can help you to make bootable media, migrate OS to SSD and so on. It is also recommended to explore more advanced functions like converting dynamic disk into basic, recover lost partition, moving applications from one drive to another drive, and converting system MBR disk into GPT.

Emily · Staff Editor
Emily is an English editor of AOMEI Technology; she has a great passion for providing easy solutions for people to tackle with all disk or partition management problems. In addition to writing articles about disk/partition management, she also edits great tutorials on how to back up and restore disk for data security. In her spare time, she loves to learn computer skill to improve herself or stay with her family to enjoy a good day.