How to Merge C and D Drive in Windows 11/10 Without Losing Data

When you face C drive is running out of space and want to extend C drive, you can choose to merge C and D drive in Windows 11/10. How to merge partitions in Windows 11/10 without losing data? You can easily merge C and D drive and extend C drive in 3 ways with a professional partition management tool.

To merge the D drive into the C drive, first back up all data from drive D to an external hard drive. Then, right-click the Start button and select Disk Management. Right-click drive D in Disk Management and select Delete Volume, which will convert it to unallocated space. Finally, right-click drive C and select Extend Volume, then follow the instructions to transfer the unallocated space from the D drive to the C drive.

Relax and stay here if you are looking for a solution to combining two partitions as one of the above examples. Many users have encountered the situation that C drive is running out of space. While facing such a problem, you can choose to merge C and D drive in Windows 11/10 to troubleshoot easily, especially when the D drive is nearly empty or has lots of free space.

But how to merge C and D drive in Windows 10/11 without losing data? Follow this guide, you'll get 2 reliable methods guiding you to accomplish this task like an expert.

How to Merge C and D Drive in Windows 11/10 Without Losing Data

• ✔️Apply to: Combine two adjacent disk partitions.
• ✔️Premise: The two partitions are on the same physical disk.
• ✔️Operation Difficulty: Low
• ✔️Data Loss: No 

To merge C drive and D drive in Windows 11/10/8.1/8/7/XP computers, a professional partition manager like EaseUS Partition Master is the simplest way that you can trust. It enables you to merge C and D drive without losing data easily. 

Step 1: Select the target partition

Right-click on the partition which you want to add space to and keep, and select "Merge".

Step 2: Select a neighbor partition to merge

Select one partition next to the former selected partition to merge.

And click "OK" to continue.

Step 3: Execute operation to merge partitions

1. Click the "Execute Task" button at the top and then click "Apply".
2. The program will merge space and add files from the second partition to the first partition.

In addition to merging C and D drives as one, EaseUS Partition Master provides more one-stop disk partition features, such as cloning disk, creating/deleting/formatting partition, wiping data, disk/partition conversion, and migrate OS to SSD without reinstalling, etc.

Feel free to share this amazing tool with more of your friends and help them execute partition management tasks like an expert with ease:

How to Manually Merge C Drive with D Drive 

Aside from turning to third-party partition manager software, you can use Windows Disk Management to merge the C drive and D drive because this Windows advanced storage tool is free to create, delete, extend, shrink, merge partitions, or change a drive letter. 

However, it requires you to be very careful while executing the task to merge the C drive and the D drive as one partition. Also, be sure that you are careful with the following steps:

Step 1. Back up your Data: 

Before you begin, back up all the important data on your D drive to an external hard drive or cloud storage using EaseUS Todo Backup, as this merge process will erase all the existing data on your D drive. 

Step 2. Open Disk Management via one of the following clicks.

• Right-click the Start button > select Disk Management to open it.
• Press Windows + X > choose Disk Management to open it.
• Press Windows + X > select Computer Management > under the Storage tab, click Disk Management to open it.
• Press Windows + R to open the Run box > type diskmgmt.msc in the search bar > click OK or press Enter to open this utility.

Step 3. Delete the D Drive: 

Locate the D drive in the Disk Management window > right-click the target D drive > click Delete Volume > click Yes. 

Step 4. Extend the C drive: 

Right-click on the C drive > select Extend Volume.

Step 5. The Extend Volume Wizard will open > click Next > input the size of the unallocated space created from the D drive and merge it into the C drive > click OK. 

After this, you'll see the C drive is extended and the D drive is gone on your computer. If you feel like this manual method, share to help more of your friends online:

How to Extend C Drive Without Data Loss in 2 Ways 

Except for merging partitions, there are two ways to extend the C drive without data loss by using EaseUS partition manager software: one is resizing and moving drives, and the other is allocating space from the D drive to the C drive straightway.

1. Extend System Partition

When your disk has no unallocated space and you don't want to erase or format it, you can use EaseUS Partition Master's Resize/Move partition feature to enlarge the C drive.

Extend System C drive with unallocated space

1. 1. Right-click on the System C: drive and select "Resize/Move".
2. 2. Drag the system partition end into the unallocated space so to add it to the C: drive. And click "OK". 
3. 3. Click "Execute Task" and "Apply" to execute the operations and extend the C drive.

2. Allocate Space from D to C to Increase C Drive

Here is the quickest and easiest way to extend C drive by moving space from other drives to the system drive without unallocated space. You can D, E, F, or any partition with free space to allocate space to the C drive. Let's show how to move space from D drive to C drive using EaseUS Partition Master.

Step 1. Right-click on the D: partition with enough free space and select "Allocate Space".

Step 2. Select the target partition - C: drive and drag the partition panel rightward to add the free space from D: drive to C: drive. Then click "OK" to confirm.

Step 3. Click the "Execute Task" button and click "Apply" to start the process of moving free space from D: drive to C: drive.

To Sum Up

This post shows you how to merge C and D drive in Windows 11/10 without losing data by applying one of the world-renowned partition managers - EaseUS Partition Master. With this tool, you can effectively merge partitions in Windows 11/10/8/7.

What's more, we also introduce two ways to extend C drive without deleting or formatting using EaseUS disk management software, which can help you organize your hard drive and empty disk space to enhance operating system performance. 

More FAQs About How to Merge C and D Drive

Now, let's check more hot topics about how to merge C and D drives in Windows 11/10 without losing data.

1. Is it safe to merge C and D drives?

Yes, you can safely merge C and D drives without losing any data with a reliable disk management tool like EaseUS Partition Master. This partition master enables you to merge partitions in Windows 11/10 without deleting any partitions.

2. How do I merge C and D drives in Windows 11/10 without losing data?

How do I combine C and D drives? You can make it with only three steps:

Step 1. Install and launch EaseUS Partition Master. Right-click on the C drive and select Merge.

Step 2. Select D drive next and click OK to continue.

Step 3. Click the Execute Operation button at the top and then click Apply to start merging the C and D drives without losing data. 

3. How can I use a D drive when the C drive is full?

When the C drive is running out of space, you have three ways to use D drive space to extend the C drive if the D drive is to the right of the C drive in the graphical layout:

1. Delete the D drive and extend the C drive with the unallocated space via Disk Management or third-party partition assistant.

2. Shrink the D drive and use the EaseUS partition manager to increase the C drive with unallocated space.

3. Directly move the free space from the D drive to the C drive with the EaseUS partition manager, even if there is no unallocated space.

4. How do you increase D drive space from C drive in Windows 11/10?

You can use the Allocate Space function of EaseUS Partition Master to easily move space from C drive to D drive to increase D drive space.

Step 1. Free Download and Install EaseUS Partition Master. Right-click C drive and select Allocate Space.

Step 2. Select the D drive as the target partition. Drag the partition panel rightward to add space allocated from the source partition to the target one. Then click OK to confirm.

Step 3. Click the Execute Operation button and click Apply to start to increase D drive space from C drive.