Merge C and D or E drive in Windows 10

Updated on: November 16, 2019

This article introduces how to combine C: and D: drive in Windows 10 (32 & 64 bit) without losing data. With disk partition software, you can resize and merge C, D, E or any other drives easily.

The same with previous versions, Windows 10 C drive runs out of space, because many types of files are writing into C drive continuously. Nobody likes to start from scratch, so some people wonder whether it is possible to merge C and D drive together without losing data. By merging drive D into C, unused space in it will be also transferred into C drive. This is indeed a way to increase C drive free space.

How to combine C and D drive

To merge C and D drive for Windows 10 computers, you may either use native Disk Management or third party partitioning software.

Windows 10 Disk Management has no Merge Volume function, but you can achieve with Extend Volume function indirectly.

Option 1: Steps to merge C and D drive in Windows 10 Disk Management:

  1. Press Windows and X on the keyboard, select Disk Management from the list.
  2. Right click drive D: and select Delete Volume.
  3. Right click drive C: and select Extend Volume.
  4. Simply click Next till Finish in the pop-up Extend Volume Wizard window.

You'll lose data in drive D if you forget to transfer files before deleting.

Option 2: Merge C and D drive with partition editor

Windows Disk Management can only delete a volume and merge to the left adjacent partition. With professional partition software, you just need to select two contiguous partition and everything will be done.

Download NIUBI Partition Editor and follow the steps below:

Step 1: Right click C or D drive and select "Merge Volume".

Merge volume

Step 2: Click the check-box in front of C and D drive, and then click OK.

Combine C and D

To avoid system damage, merging system partition C to D is disabled.

Step 3: Click Apply on top left to execute, done. After it complete, all files in partition D will be transferred to a folder in C.

C and D combined

It is much easier by this method and files will be transferred automatically. However, the same with Disk Management, partition D will be deleted. So If you installed programs in D drive, there's still an issue even if you transfer all files to other partition.

All shortcuts of the programs that point to D drive and part of programs stop working, because there is no longer D drive. You'd better resize disk partition instead of merging.

Resize partition instead of merging

By resizing partitions, part of unused space in drive D will be converted to Unallocated. This kind of space can be combined into C drive and converted to unused space again. By this method, all files in D keep intact, Operating System, programs and everything else keeps the same.

Watch the video how to shrink D and extend C drive:

Video guide

How to merge C and E drive

No partitioning software can merge two nonadjacent partitions directly. If you want to combine C and E drive in Windows 10, you have to back up files and delete partition E, then follow the steps below:

Step 1: right click drive D: and select Resize/Move Volume, drag the middle position rightwards in the pop-up window.

Move D drive

Unallocated space will be moved to the left side of D.

Unallocated space moved

Step 2: right click drive C: and select Resize/Move Volume, drag the right border rightwards in the pop-up window.

Extend C drive

Unallocated space will be merged into C drive, click Apply to execute.

C and E merged

Comparing with Windows built-in Disk Management, while merging volume D: to C, NIUBI Partition Editor can delete D and move all files into C drive automatically. Comparing with merging partitions together, resizing partitions can keep everything in D intact, so it is suggested.

No matter you want to combine C and D drive (adjacent), shrink D to expand C, or merge drive E to C (nonadjacent), you'd better back up and run safe partition software.

Among these software, NIUBI Partition Editor provides innovative technologies to ensure system and data intact including:

It is also much faster because of its advanced file-moving algorithm.