Merge Partitions with AOMEI Partition Assistant

March 11, 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?

To merge partitions is to combine two or more partitions together. 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 more partitions but the number of your partition reaches the upper limit.
You can merge partitions with built-in Disk Management. However, you need to delete the other partition before merging since Disk Management cannot directly resize the partition. Fortunately, there is AOMEI Partition Assistant which can merge partitions directly without deleting other partitions in advance. Except 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
This operation may change the original location of your data, so we suggest you to learn the tutorial “How to Safely Partition” before executing this operation.
You can only merge 2 partitions in one time, and the two partitions must be adjacent. However, you can merge two or more parts of unallocated space into a partition.
You can merge data partition into system boot drive, however, you cannot merge system boot drive into data partition.
"System Reserved" partition could not be merged.
System partition or boot partition cannot be merged with the front partition.
Partitions lays on different hard disks can’t be merged.
Merge two nearly full partitions is not recommended for might cause data loss. Since 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 merge two partitions and merge 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 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.
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 the 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 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 to close them or perform the operation under PreOS Mode.
The host partition (destination partition) need to have at least 1 GB free space before merging. If there is not, try to get from other partition or unallocated space by resizing partition.
You may still encounter other problems during merge partition process, please refer to “Cannot Merge Partitions”.