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How to Merge Unallocated Space Windows 11/10/7

Updated by Roxanne on Sep 22, 2022
Written by Jean

You can merge unallocated space Windows 11/10 or Windows 7 with the traditional Windows Disk Management or the optimizing third-party partition magic software - EaseUS Partition Master, which allows the most direct way to add unallocated space to C drive or other disk volumes without affecting data.

Workable Solutions Step-by-step Troubleshooting
Merge Unallocated Space to C Drive (EaseUS Partition Master)

#1. Merge Unallocated Space in Windows 11/10 (non-adjacent)...Full steps

#2. Merge Windows 11/10 Unallocated Space on a Disk Larger than 2TB...Full steps

Add Unallocated Space to C drive Step 1: Install and run Disk Management. Right-click the partition you want to add the unallocated space to and...Full steps

What Is Unallocated Space

The unallocated space is explained as a block of free space that Windows hasn't assigned a drive letter to it. Without allocation, the operating system won't recognize the space nor allow for writing files to it. To make full of the unallocated space on your hard drive, you can either create a new partition on it or merge it into an existing partition.

In Windows, the Disk Management program is where you can view the unallocated space, and this is how it looks like:

unallocated space in windows disk management

In addition, third-party alternatives also come with a disk map where unallocated space will show up. On EaseUS Partition Master, this is how unallocated space displays itself:

unallocated space in easeus partition master

How Do I Merge Unallocated Disk Space in Windows 11/10

Since the unallocated space is treated as a missing part of used space on a hard drive in Windows, why not put it in practical use right now? If you're interested in merging unallocated disk space instead of creating a new one, there are two ways for you to safely transfer the unallocated space.

  1. 1. Add unallocated space to C drive
  2. 2. Merge unallocated space to a data partition

Both Windows Disk Management and EaseUS Partition Master enable the possibility of merging the unallocated space to the desired partition, but they differentiate each other regarding whether the two are continuous or not.

Can I Combine Two Unallocated Space

Are you seeing two more unallocated space on your computer hard drive like me? Never mind. You can manage as many unallocated partitions as you can with an appropriate partition tool. Though both tools are technically capable to handle the unallocated space, they function in totally different ways. The more unallocated space you get, the more complicated for you to solve in Disk Management. Whereas EaseUS Partition Master comes handy for the purpose of making it fast, meanwhile getting it done without affecting other partitions and present data!

two unallocated space

How to Merge Unallocated Space to C Drive in Windows 11/10/7 with EaseUS Partition Master

As you've learned in advance, EaseUS partition manager software could handle one more unallocated space that is either continuous or non-continuous with the C drive, or other disk volumes you set your mind to spare the unallocated space. What's more, it is competent enough to get you out of trouble to solve low disk space even there is no unallocated space to extend the system partition.

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#1. Merge Unallocated Space in Windows 11/10 (non-adjacent)

Step 1. Locate the Target Partition.

Go to Partition Manager, locate the target partition and select "Resize/Move".

Select target partition to extend

Step 2. Extend the Target Partition.

Drag the partition panel rightward or leftward to add the unallocated space into your current partition and click "OK" to confirm.

choose another drive to allocate space

Extra Option: Get Space from Another Drive

If there is not enough unallocated space on your disk, right-click on a big partition with enough free space, select "Allocate space".

Then select the target partition that you want to extend at the allocate space to column.

choose another drive to allocate space

Step 3. Execute Operations to Extend Partition.

Drag the dots of the target partition into the unallocated space and click "OK".

finish extending partition

Then Click the "Execute Task" button and click "Apply" to keep all the changes. 

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#2. Merge Windows 11/10 Unallocated Space on a Disk Larger than 2TB

If your hard disk is larger than 2TB and initializes it to MBR, it will divide it into two unallocated space in Disk Management. As we know, MBR only supports disk up to 2TB. You need to convert MBR to GPT before merging unallocated space larger than 2TB. 

merge unallocated space larger than 2TB 1

You may try the Disk Management to convert but it is grayed out. Because the built-in tool can only convert partition format on an empty disk. Don’t worry. Here is a better solution to convert partition style without wipe any data - EaseUS Partition Master.

Step 1. Download and launch EaseUS Partition Master on your computer.

Step 2. Go to Disk Converter, select "Convert MBR to GPT" and click "Next" to continue.

convert MBR to GPT - 1

Step 3. Select the target MBR disk that you tend to convert to GPT, and click "Convert" to start the conversion.

convert MBR to GPT - 2

Now you can see the two unallocated space becomes one. Then you use Disk Management to merge it to another disk or apply EaseUS Partition Master to merge unallocated space in Windows 11/10.

merge unallocated space larger than 2TB 2

How to Add Unallocated Space to C drive

To merge unallocated space to the C drive with Windows Disk Management, you need to use the "Extend Volume" function. You must make sure that the unallocated space is continuous to the system partition. For example, it should be C: + Unallocated + D:, so that you can directly right-click on the C drive and choose "Extend Volume..." to start merging the unallocated space to the C drive. Open the Disk Management and try the steps one by one.

Step 1: Install and run Disk Management. Right-click the partition you want to add the unallocated space to and then choose Extend Volume to merge Partitions (e.g. C partition). 

Step 2: Follow the Extend Volume Wizard and then click Finish. 

Step 3: In the pop-up window, you will realize the size of partition has been increased.

merge unallocated space to c drive under disk management

In any case, the unallocated space is not on the neighboring right side of the C drive, you cannot add unallocated space to the C drive because the Extend Volume greyed out.

By contrast, it's more flexible to have EaseUS Partition Master to deal with either an adjacent or non-adjacent unallocated space in Windows 11/10/8.1/8/7/XP/Vista. What are the overwhelming features that make it stand out when it comes to a comfortable and straightforward way to add space to the C drive without losing a single data?

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1. Resize/Move partition

Where is the unallocated located? Has it to be on the right side of the C drive? What about the C drive and unallocated space is separated by the drive D, E or F? It doesn't matter even you catch up in all the situations because you are still empowered to use a simple 'drag and move' method to swallow all the unallocated space into the system drive.

2. Allocate Space

This feature is newly added in the recent software update. The most amazing part is that you don't even consider whether you currently have unallocated space or not, which saves an essential step to shrink one partition to create unallocated space in order to extend the C drive before. Windows Disk Management is not expected to own this feature in the coming days.

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About the Author

Updated by Roxanne

Roxanne is one of the main contributors to EaseUS and has created multiple posts on digital devices like PCs, Mobile phones, tablets, Mac, etc. She loves to share ideas with people of the same interest.

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Written by Jean

Author Jean has been writing tech articles since she was graduated from university. She has been part of the EaseUS team for over 5 years. Her special focuses are data recovery, disk partitioning, data space optimization, data backup and Mac OS. By the way, she's an aviation fan!

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Product Reviews

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  • I love that the changes you make with EaseUS Partition Master Free aren't immediately applied to the disks. It makes it way easier to play out what will happen after you've made all the changes. I also think the overall look and feel of EaseUS Partition Master Free makes whatever you're doing with your computer's partitions easy.

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  • Partition Master Free can Resize, Move, Merge, Migrate, and Copy disks or partitions; convert to local, change label, defragment, check and explore partition; and much more. A premium upgrade adds free tech support and the ability to resize dynamic volumes.

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  • It won't hot image your drives or align them, but since it's coupled with a partition manager, it allows you do perform many tasks at once, instead of just cloning drives. You can move partitions around, resize them, defragment, and more, along with the other tools you'd expect from a cloning tool.

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