How to Combine Two Unallocated Partitions in Windows 7/8/10 by Quickest Method?

February 20, 2019

Get unallocated space distributed on your hard drive? To make full use of these unallocated spaces, you’d better combine them first and then create new partition or add unallocated space to another existing partition.

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 showing there without reasons. In fact, you are likely to get unallocated space after cloning from small hard drive to 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, add 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 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”. That partition will become unallocated space, and combine the before and after unallocated spaces automatically.

Delete Volume

Next, create 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

Alternatively, you can turn to powerful third party software AOMEI Partition Assistant Professional. No need to delete any partitions using this software so that the risk of losing data will be minimized. It also saves the trouble of backing up and restoring partition. Within a few clicks, all unallocated space will be merged into a larger one. This software also supports add unallocated space to C drive in one-click. If there is redundant free space in other partitions, AOMEI Partition Assistant Professional allows you to allocate the free space to another partition say system drive directly. Download to learn the detailed steps of combining two unallocated partitions in Windows 10, 8, 7 and Windows XP.

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

Step1. Install and start AOMEI Partition Assistant. Right click one of the unallocated spaces and select “Merge Partitions”.

Select One Unallocated Space

Step2. Check the other unallocated space and one target partition you want to merge to here, for example, C drive.

Tick Another Unallocated Partition

Step3. 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. Download to learn more.