Merge Partitions with AOMEI Partition Assistant

August 10, 2022

This post shows you how to merge two partitions into one or merge unallocated space into one partition to increase the size of destination partition.

Why do you need to merge partitions?

You may construct a bigger hard drive and increase the available space on a partition by combining two partitions into one. This is incredibly beneficial if your discs are filling up and you need additional room to store files, programs, and other items. You may need to merge partitions when:

One of your partitions is running out of space while other partitions are nearly empty.
There are a few partitions on the hard disk and you want to get a fewer number of partitions so as to make it easy to manage them.
You want to create new partitions to classify your data files but the number of your partition reaches the upper limit.

There is built-in Disk Management for you to merge partitions, however, you need to delete the other partition before merging since Disk Management cannot directly resize the partition.

Fortunately, there is a third-party tool AOMEI Partition Assistant which can merge partitions directly without deleting other partitions in advance. And except for partition merging, there are a lot of other functions provided by Partition Assistant while Disk Management does not have, such as split partition, partition/disk copy, partition recovery, and partition alignment.

▶ Before you do

1. This operation may change the original location of your data, so we suggest you learn the tutorial “How to Safely Partition” before executing this operation.

2. You can only merge 2 partitions at one time, and the two partitions must be adjacent. However, you can merge two or more parts of unallocated space into a partition.

3. You can merge the data partition into the system boot drive, however, you cannot merge the system boot drive into the data partition. The "System Reserved" partition could not be merged.

4. System partition or boot partition cannot be merged with the front partition.

5. Partitions laid on different hard disks can’t be merged.

6. Merge two nearly full partitions is not recommended for might cause data loss. Since the most merging of partitions is for getting more free space, thus merge two such partitions has no use.

How to merge?

The followings are step-by-step guides to merging two partitions and merging unallocated space into a partition. Please choose the right one according to your need.

Tips: No matter which case you choose, please download AOMEI Partition Assistant Professional Demo in order to follow the guide.

Case 1: Merge two partitions into one

Step 1. Install and launch AOMEI Partition Assistant. Right-click the partition (here is D:) which you want to merge, and select "Merge Partitions" in the drop-down menu.

Merge Partitions

Step 2. In the pop-up window, tick the partition (here is D:) in the check box and select the target partition (we choose E:) And then click "OK" to continue. In this case, all the data on partition E will be transferred into D:\e-drive.

Tick Adjacent Partition

Step 3. You can preview changes in the Pending Operations column on the left. To save the changes, please click "Apply" on the toolbar.


Case 2: Merge unallocated space into a partition

Step 1. Install and launch AOMEI Partition Assistant. In this example, there is an unallocated space before C: partition. Right-click the partition (here is C:) where you want to merge unallocated space to and select "Merge Partitions" in the drop-down menu.

Merge Partition

Step 2. In the pop-up window, tick the check box of which is in front of the unallocated space, and then click "OK" to continue. In this case, you cannot specify the target partition because system partition C is selected as the target partition in default and there is no other choice.

Tick Unallocated Space

Tip: If the two partitions you are going to merge are both data partitions, you can specify the destination partition between them.

Step 3. You can preview changes. To save the changes, please click "Apply" on the toolbar.

Apply Merge Partitions

 If the partition has running applications, AOMEI Partition Assistant will suggest you close them or perform the operation under PreOS Mode.
 The host partition (destination partition) needs to have at least 1 GB of free space before merging. If there is not, try to get from another partition or unallocated space by resizing the partition.
 You may still encounter other problems during the merge partition process, please refer to “Cannot Merge Partitions”.