By Cherry / Last Updated October 25, 2019

Merge C drive and D partition in Windows 10 to get more free space on C drive

Windows users all know that a Windows PC usually has several partitions, C, D, E, etc. Generally, the C drive is the system partition, storing Windows OS files and applications. Sometimes you need to merge C drive and D partition in Windows 10/8/7 to enlarge system partition.

>. When you upgrade your current Windows 7 or Windows 8 to Windows 10, you may find that the Windows 10 needs more space to store the system files. Thus, you may face the problem that the C drive is running out of space. If your D drive has more free space, merge C and D drive should be a good method to extend your system partition.

>. If your Windows 10 is running slower and slower, you need to check whether it is the C drive has not enough space. If it is, you can combine C drive and D drive to extend C partitions.

You may have some other reasons to merge C and D drive into one partition on Windows 10/8/7. But no matter what reasons, here you can find the best solutions.

How to merge C drive and D drive in Windows 10?

As we mentioned above, merge C drive and D partition in Windows 10/8/7 should be a good way to enlarge C drive. Well, how to merge C and D drive in Windows 10/8/7 without losing data is a hot topic. And here we provide you two effective methods to do it.

Merge C drive and D partition in Windows 10 with Disk Management

Windows operating system provides a tool Disk Management to manage disks. But as a Windows user, you may also realize that you can’t merge two partitions into one partition directly with Disk Management. Well, how to merge C and D drive with Windows Disk Management? Here you can follow the steps below:


✍Tips: if you do not want to lose data on D drive, please backup D partition or migrate all data from D drive to another drive in advanced. If you are finding a way to merge C and D drive in Windows 10 without losing data, click here to get a safer way.

Step 1. Right-click This PC > Manage > Disk Management.

Step2. After entering Disk Management, right-click D drive and then click Delete Volume option.

Delete Volume

Step3. After deleting, the D drive will show as unallocated volume. Then, you can right-click C drive and click Extend Volume option to extend your C drive with the unallocated space.

Extend Volume


Step4. After extending, you will find that the original D drive has been added to C drive.

Safely Merge C drive and D partition without losing data

In order to merge C and D drive without losing data, here we highly recommend you a freeware AOMEI Partition Assistant, which is a powerful software for disk management. With this software, you can easily resize and merge C, D, E or any other partitions.

Best Freeware for resize and merge partitions| AOMEI Partition Assistant

Resize and merge C, D, E or any other partitions with several clicks. It also allows you to create partition, split partition, format partition, move partition, etc.

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Step1. Install and launch AOMEI Partition Assistant Standard. You will see the main interface of it. Right click C drive and select Merge Partitions.

Merge Partition

Step2. Here you will move to the window where you can select the partitions you want to merge together. Just check the box in front of C and D drive as the following picture shows, and click Next.

Tick D Partition

Step3. Here you can see the main interface that the C drive and D partition are merged into one partition. Click Apply to submit all operations.

Result Preview


Finally, Wait till it finished. Here you have already merged C drive and D partition in Windows 10. The C drive is extended so that it won’t run out of space anymore and you will use the Windows 10 operating system normally.

As you can see, AOMEI Partition Assistant can do many other things like convert NTFS to FAT32, migrate OS to SSD. Actually, AOMEI Partition Assistant is powerful more than this. It still provides you AOMEI Partition Assistant Professional edition, which contains all features in the Standard edition, and many other utilities such as convert dynamic disk to basic disk and vise versa, convert primary partition to logical, and vice versa, etc. You can upgrade by the link directly.

If you are IT professionals, system administrators, technicians, and consultants, AOMEI provides Partition Assistant Technician Edition for you to serve new revenue streams through providing charged technical service to your clients. Compared different edition and choose the most suitable one for you!