The same with previous versions, Windows 10 C drive runs out of space, because many types of files are saving to C drive continuously. Nobody likes to start from scratch, so some people want to know whether it's possible to merge C and D drive together without losing data. By merging drive D to C, free space in partition D will be transferred to C drive. This is indeed a way to increase C drive free space, but it is not the best. In this article, I'll introduce how to merge C and D/E drive in Windows 10 computer with free tools.
2 ways to combine C and D drive in Windows 10
To merge C and D drive in Windows 10 computer, you may either use native Disk Management or third party partitioning software.
Steps to merge C and D drive in Windows 10 with Disk Management:
- Press Windows and X on the keyboard, select Disk Management from the list.
- Right click drive D: and select Delete Volume. (D must be Primary partition)
- Right click drive C: and select Extend Volume.
- 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. Do not delete this partition if you installed programs in it.
Windows Disk Management can only delete a volume and merge Unallocated space to the contiguous partition on the left. For example, merge D to C drive or combine E to D drive.
Combine C and D drive in Windows 10 with NIUBI Partition Editor
NIUBI Partition Editor has free edition for Windows 11/10/8/7/Vista/XP home computer users. It only requires several clicks to merge C and D/E drive. Better than Disk Management, it can merge Primary and Logical partitions, merge NTFS and FAT32 partitions.
Download NIUBI free edition and follow the steps to combine C and D drive in Windows 10 computer:
Step 1: Right click C or D drive and select "Merge Volume".
Step 2: Click the check-box in front of both C and D drive, and then click OK.
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 root directly of C drive automatically.
Resize partition instead of merging
With NIUBI Partition Editor, you can shrink the adjacent partition D and make Unallocated space on the left. Then merge this Unallocated space to C drive. In this way, you don't have to delete partition. All files in D keep intact, Operating System, programs and anything else keeps the same with before.
Watch the video how to shrink D and extend C drive:
How to merge C and E drive in Windows 10 (nonadjacent partitions)
If E: is the contiguous partition behind C drive in your computer and you want to merge C and E drive, follow the steps above and replace D with E. Drive E here means a nonadjacent partition.
If you want to merge C and nonadjacent E drive, Disk Management is useless. Because it cannot move partition or Unallocated space.
Steps to merge C and E drive in Windows 10 with NIUBI Partition Editor:
Step 1: Transfer all files in E: drive to other place, right click this partition in NIUBI Partition Editor and select "Delete Volume".
Step 2: Right click D: drive and select Resize/Move Volume, drag the middle of D drive rightwards in the pop-up window.
Unallocated space will be moved to the left side of D.
Step 3: right click C: drive and select Resize/Move Volume, drag right border towards right in the pop-up window.
Unallocated space will be merged into C drive, click Apply to execute.
Besides merging partitions in Windows 11/10/8/7/Vista/XP, NIUBI Partition Editor helps you do many other disk partition management operations such as shrink, extend, move, convert, defrag, copy, hide, wipe partition, scan bad sectors and optimize file system.