By Teresa / Last Updated July 8, 2020

Why combine two unallocated partitions?

I have two unallocated partitions in the same hard disk, 40 GB and 35 GB. How to merge both of them to make one partition? They are separately distributed by my E partition. Please recommend any good program.”

Do you encounter the same situation that too many unallocated spaces on the hard drive separately? They may come with the system or just show there without reasons. In fact, you are likely to get unallocated space after cloning a small hard drive to a larger one. To merge two unallocated partitions in Windows 8, 7, 10 will take full advantage of disk space. Creating one new partition as covered using the unallocated partition is not a bad choice.

Besides, adding unallocated space to partition in Windows 10 after combining may help to enlarge that drive, which offers higher performance in system and software. What’s more, merging unallocated space in Windows 7 and other operating systems makes the partition statues cleaner and simpler so that administrators can manage them easier. For example, more concise in deploying the same layout to other computers. Whatever you want to about that unused space, the first thing to learn is how to merge two unallocated disk space.

How to combine two unallocated partitions?

Traditionally, there is a roundabout way to merge them. To be specific, backup the partition that in between two unallocated space first using partition backup software. Then delete it by “Delete Volume” feature. That partition will become unallocated space, and combine the before and after unallocated spaces automatically.

Delete Volume

Next, create a new partition with the resultant blank space by selecting “New Simple Volume”. Finally, restore the backup image to the new partition if necessary.

New Simple Volume

But this way needs you to delete a partition that will lose you data. And the steps are tiresome. Is there easier way to combine two unallocated partitions without data loss?

Steps to merge unallocated partitions in Windows 10 via AOMEI Partition Assistant

Yes, you can turn to powerful third-party software AOMEI Partition Assistant Professional. No need to delete any partitions so that the risk of losing data will be minimized. It also saves the hassles of backing up and restoring the partition.

And within a few clicks, all unallocated space will be merged into a larger one. This software also supports adding unallocated space to C drive in one-click. If there is redundant free space in other partitions, you can also use it to allocate the free space to another partition like system drive directly. It can combine two unallocated partitions in Windows 10, 8, 7 and Windows XP. For Server users, there is AOMEI Partition Assistant Server to help.

And you can install the Demo version to have a try firstly.

Step 1. Install and start AOMEI Partition Assistant. Right click one of the unallocated spaces and select “Merge Partitions”.

Select One Unallocated Space

Step 2. Check the other unallocated space and one target partition you want to merge here, for example, C drive.

Tick Another Unallocated Partition

Step 3. Click “Apply” to execute the pending operations.



  • There should have reboot required since it involves system drive.

  • If you want to create new partition with these two unallocated spaces instead of adding them to other partitions, create a partition with one unallocated space first and then repeat above steps to add the other unallocated space in.

Given all this, it isn’t hard to answer the question of how to combine two unallocated partitions in Windows OS with the help of AOMEI Partition Assistant. This partitioning software provides other basic disk operations, such as resize partition, delete partition, format partition etc. Other helpful features are displayed in the wizard pane, for instance, installing Windows 10 on external hard drive by Windows To Go feature; securely erase SanDisk USB files via Wipe Hard drive function.