How to Move Unallocated Space to C Drive in Windows 10/11

This article provides a detailed guide on how to move unallocated space next to C drive and introduces three ways to help you transfer unallocated space to C drive.

Can I move unallocated space to C drive? Sure, you can add unallocated space to the C drive using Disk Management, Diskpart, or third-party disk managers.

Unallocated space is blank disc space, not showing up in the File Explorer, which does not belong to any partition and can be used by the user to extend another partition or create a new volume. In most cases, users may want to use the unallocated space to extend another partition. This article from EaseUS will detail three ways to move unallocated space to C drive on Windows 11/10/8/7, so just continue to read.

1. Way 1. Move Unallocated Space to C Drive with EaseUS Partition Master
2. Way 2. Move Unallocated Space to C Drive with Disk Management
3. Way 3. Move Unallocated Space to C Drive with Diskpart

How to Move Unallocated Space to C Drive - 3 Ways

Transferring unallocated space to the C drive is a good way to expand the system drive so that you can install more apps and programs there and keep others running properly. In this part, there are three ways to move unallocated space to C drive.

Here is a table to help you choose a suitable way to move unallocated space to C drive. It is clear that EaseUS Partition Master is easier to use, isn't it?

When the unallocated space is on the right side of the C drive, Windows allows users to extend the volume using Disk Management or Diskpart directly.

However, you might find "Extend Volume" grayed out in Disk Management, and you might see "Diskpart failed to extend the volume error" happen in Diskpart, which is because the unallocated space you choose is not adjacent to the C drive on the righthand.

In this circumstance, you may need your nice helper, EaseUS Partition Master Professional. This tool breaks through Windows's limitations and thus can help you move the unallocated storage space next to your C drive that other built-in utilities can't.

Well, after moving the unallocated storage space next to your C drive, let's start transferring unallocated space to the C drive. Of course, you don't have to move the unallocated space to the C drive in advance if you are moving the unallocated space to the C drive with EaseUS Partition Master.

Way 1. Move Unallocated Space to C Drive with EaseUS Partition Master

EaseUS Partition Master is a professional disk management tool for Windows users. It supports almost every version of Windows, so don't worry about compatibility. This tool helps you assign unallocated space to any side of the partition. It is easy to use, and you are sure to like its clear interface. It offers 2 options to help merge the C drive with unallocated space. Now, download this practical software and follow these steps to move unallocated space to C drive.

Option 1. Move Unallocated Space to C Drive

Step 1: Free up unallocated space for C drive.

If there is no unallocated space on the system disk, go to Partition Manager and right-click on a partition next to the C: drive and select "Resize/Move".
Drag left panel of the partition to shrink and leave unallocated space behind the system C: drive and click "OK".

Step 2: Increase C drive space.

1. Right-click on C: drive and select "Resize/Move".

2. Drag the system partition end into unallocated space so to add space to C: drive, or click the "fill in all unallocated" and click "OK".

Step 3: Keep all changes to extend C: drive.

Click the "Execute Task" and click "Apply" to keep all changes so to extend the system C: drive.

Option 2. Merge Unallocated Space to C Drive Directly

EaseUS Partition Master also offers an option for users to combine C drive and unallocated space with a few simple clicks. Here is how:

Step 1. Go to Partition Manager, right-click C drive and select "Merge."

Step 2. Select the non-adjacent unallocated space to merge, click "OK."

Step 3. Click the "Execute Task" button and click "Apply" to start merging partitions.

Besides moving unallocated space to C drive, does EaseUS Partition Master help with other issues? Of course. Let's learn more about it in the next part.

What Can EaseUS Partition Master Do?

As a professional and efficient disk manager, EaseUS Partition Master can help with many problems. Its specific features are as follows:

• Migrate OS to SSD/HDD
• Extend hard drive partitions
• Move space from D to C
• Expand SSD C drive across disks
• Move, merge, resize, and create partitions

Well, if you are tired of these disk management or are not an expert in computing, you will enjoy downloading EaseUS Partition Master. It can free you from these irritating disk management issues.

Way 2. Move Unallocated Space to C Drive with Disk Management

Microsoft has retained the Windows Disk Management utility tool in Windows 10/11, so users can use it to add unallocated space to the C drive. Follow these steps to perform this action.

Step 1. Hit the Windows key + R at the same time to launch Disk Management via the "Run" window.

Step 2. Then, type the following command and click OK:

diskmgmt.msc

Step 3. Once you launch Disk Management, right-click on the C drive. Then, select "Extend Volume" to extend your C drive.

Way 3. Move Unallocated Space to C Drive with Diskpart

As we have mentioned, you can also use Diskpart to move unallocated space to the C drive. Let's learn how to perform this action.

Step 1. Hit Windows + R key to open the "Run" option. Type diskpart and hit Enter. Run it as administrator.

Step 2. Then, hit Enter every time you type a command below:

• list disk
• select disk x (Replace x with the correct number)
• list volume
• select volume c (Replace c with the correct partition number)
• extend size=10240 (Change 10240 with the quantity you want to extend)
• exit

Then, you have moved your allocated space to the C drive via Diskpart.

Besides, we prepare some links for you if you meet problems, like:

Why Move Unallocated Space Next to C Drive?

The C drive is the storage location where the operating system is installed. And many programs are installed by default on the C drive. Therefore, the reasons why move unallocated space to C drive are as follows:

• Increase C drive storage capacity
• My C drive is full without reason
• Make it easy to create personal files
• Keep pro grams on C drive running properly

Many temporary files or caches are also generated with daily use. Then the C drive can easily fill up and show a red bar in Windows File Explorer. To make matters worse, the user will receive a warning occasionally that the disk is running out of space. In this case, it is essential to move the unallocated space to your C drive and make it bigger.

However, if you don't have any available unallocated space on the disk, the best option is to transfer some of your programs from the C drive to another drive to free up space on C drive. You can check the article below to learn the details.

🚩Further Reading: How to Move Programs from C Drive to D Drive Windows 10

Many users are confused by the non-adjacent unallocated space issue. You can click the button below to share and help.

Conclusion

These are the three ways how to move your allocated space to C drive. But Diskpart and Disk Management can only work when your unallocated space is adjacent to your C drive on the right side. Therefore, if your unallocated space is separately distributed on the drive, EaseUS Partition Master is a nice choice. You will like it. Well, if you have other questions, the next part may help you.

You may also like to know:

FAQs About Move Unallocated Space to C Drive

Do you know how to move unallocated space to your C drive now? This part lists three other questions related to moving or transferring unallocated space to the C drive. Hope it can help.

1. How do I move unallocated space next to C drive?

You can try a third-party disk software, EaseUS Partition Master. It can help move the unallocated space next to the C drive, and after that, you can add the space to the C drive.

2. Why can't I add unallocated space to C drive?

That may be because the unallocated space you choose is not adjacent to the C drive on the righthand. You can use a third-party tool to move your unallocated space to the C drive.

3. How do I merge unallocated space to the C drive in Windows 10?

You can use Windows 10 built-in tool, Disk Management, to help. Now, follow these steps:

• Install and launch Disk Management. 
• Right-click the targeted partition you want to add your unallocated space to and then select the "Extend Volume" option to merge partitions.
• Follow the Wizard and then click "Finish."