How to Merge C and D Drive in Windows 10 Without Losing Data - EaseUS

Roxanne updated on Oct 15, 2020 to Partition Manager | How-to Articles

Q: Can I merge C and D drive in Windows 10 without losing data?

"I upgraded my computer from Windows 7 to Windows 10 and installed some new game software. As everything defaults to C, there are more and more data stored in C drive. Now I find that my system partition is nearly out of space while D drive has lots of free space. So, I want to merge C and D drive to enlarge the boot partition for better performance. 

But the Disk Management doesn't offer the option to merge C and D drive; if I insist on using Disk Management to do it, I have to delete D drive. I am wondering how I can merge C and D drive without losing data. Any suggestions?"

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 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 without data loss? Read in-depth.

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

To merge C drive and D drive in Windows 10 computers, the simplest way is using a professional partition manager - EaseUS Partition Master, which enables you to merge partitions without data loss effortlessly. 

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 Windows 10 is supported

In addition to merging partitions, EaseUS Partition Master provides more one-stop disk partition features, such as clone disk, create/delete/format partition, wipe data, disk/partition conversion, migrate OS to SSD without reinstalling, and so on.

Now, download EaseUS Partition Master and follow the steps below to merge C drive and D drive in Windows 10 without losing data. The screenshot shows how to merge E and F partitions. Merging C and D drive works the same way. 

 

Step 1: Install and launch EaseUS Partition Master on your PC

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

Run EaseUS partition manager software

Step 2: Select partitions to merge

1. Select one partition next to the former selected partition.
2. And click "OK" to continue.

Select partitions to merge

Step 3: Merge partitions

1. Click the "Execute Operation" 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.

Select partitions to merge

See More: How to Extend C Drive Without Data Loss in 2 Ways 

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

1. Extend System Partition by Resizing Drives

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 Windows 10 is supported

Step 1: Launch EaseUS Partition Master

Run EaseUS Partition Master

Step 2: Add space to the System C drive

1. Shrink partition and leave unallocated space for extending C: drive:

  • Right-click on a partition next to the C: drive and select "Resize/Move".
  • Drag the end of the partition that is next to the C: drive and shrink it, leaving unallocated space next to the system C: drive, and click "OK".

2. Right-click on the System C: drive and select "Resize/Move".

Extend System partition

To add space to the C: drive, drag the system partition end into the unallocated space.

Add space to C drive

Step 3: Confirm to extend system C drive

Click the "Execute Operation" button, it will list the pending operations, and click "Apply" to execute the changes and extend the C drive.

Confirm to extend system 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.

Step 1. Right-click on the D partition with enough free space and select "Allocate Space" to allocate the free space to the C drive.

Select partition to allocate space

Step 2. Select the target partition that you need to extend, here, choose C drive. Drag the partition panel rightward to add space allocated from the source partition to the target one. Then click "OK" to confirm.

Allocate space to extend partition

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

finish extending partition

To Sum Up

This post shows you how to merge C and D drive in Windows 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 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. 

Download Now

 Windows 10 is supported

More FAQs About How to Merge C and D Drive

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

Is it safe to merge C and D drive?

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

How do I merge C and D drive in Windows 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 to merge C and D drive without losing data. 

How can I use D drive when C drive is full?

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

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

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

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

How do you increase D drive space from C drive in Windows 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 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.

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Frequently Asked Questions

Why Choose EaseUS Partition Master?

"I've used Partition Master Professional many times to create, delete, format, move, rename, and resize partitions."PCWorld

"Partitioning tools have come a very long since the days of complicated command line utilities and EASEUS Partition Master is one of the most advanced programs available."TECH ADVISOR

"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."Lifewire

Will the "Migrate OS" feature transfer the Windows system files only or the whole C drive?

To ensure that the migrated system will boot normally, the Migrate OS feature will transfer all the files in the system and the boot partitions. Generally, the boot partition is the C drive so the transfer will include all the files in C.

Does EaseUS Partition Master license apply to multiple computers?

The license of Partition Master Professional and Server editions can be used on 1 computer only, while that for for the Technician and Unlimited editions can be used on multiple machines.

What is the difference between EaseUS Partition Master Trial version and the Free version?

Free is for home users only, with most basic functions available such as partition resize and clone. While trial can help you understand how this product works and test what a full license can do on a business or server OS machine.

Will it cause any data loss after resizing the partition in EaseUS Partition Master?

Generally, it will not cause any data loss or boot issue by resizing a partition. However, in order to protect your data, we suggest that you backup the partition before resizing, in case of any unexpected situations such as power outages, computer hardware failures, etc. You can use EaseUS Todo Backup to backup the partition and its trial version is fully functioned for 30 days.

What should I prepare before resizing the partition?

On the partition that is going to be operated, there might be some files being occupied by other programs. To ensure a successful operation, we suggest that you close all the unnecessary software before resizing that partition. Otherwise, EaseUS Partition Master will detect the partition being locked by the other software and require a reboot to resize the partition under boot mode.

About EaseUS Partition Master

All-round disk & partition management software for personal and commercial use. Let it manage your storage drive: resize, format, delete, clone, convert, etc.

Video Tutorial

How to Partititon a Hard Drive on Windows 10/8/7