How to merge C and D drive without losing data?

All disk partitions are created when building the server or computer, many people ask if it is possible to merge partitions together. The answer is definitely yes. Some people want to combine two data drives to reduce the numbers of disk partitions for easier recognition, but other people want to merge C and D drive to increase C drive free space. No matter you want to merge data drives or system partition, the steps to merge partitions are similar. In this article, I’ll show you how to merger C and D drive in Windows Server 2003/2008/2012/2016 (R2) and Windows 10/8/7/Vista/XP.

Windows built-in utility to merge C and D drive

In Windows Server 2008/2012/2016 and Windows 7/8/10, you can combine C and D drive in Disk Management console indirectly. Why indirectly? Because there is no Merge Partition function in DM, you have to merge C and D drive by deleting and extending partitions.

Steps to merge C and D drive in Disk Management:

  1. Transfer all files in partition D to C or other device.
  2. Press Windows and R to open Run, input “diskmgmt.msc” and press Enter to open Disk Management console.
  3. Right click drive D and select “Delete Volume“, D drive will be deleted.
  4. Right click drive C and select “Extend Volume“, the disk space of D will be merged into C drive.

Merge C and D with 3rd-party software

Step 1: Back up or transfer data, download and launch NIUBI Partition Editor, right click drive D: and selcet “Delete Volume“.

Delete volume

The disk space will be changed to Unallocated, which can be combined into C drive.

Unallocated created

Step 2: Right click C drive and select “Resize/Move Volume“. In the pop-up window, drag the right border rightwards to hold the Unallocated space.

Extend C drive

Unallocated merged

Step 3: Unallocated space will be merged into C: drive. Click Apply on top left to execute.

If your aim is to expand C drive, it is NOT a good idea to delete and merge partitions. Actually, you can shrink D to get free space and then add into C drive. If you delete drive D, applications and services running from it will stop working. If there is not enough free space in drive D, you can get free space from any other drive in the same disk.

Steps to merge free space of D into C drive:

Step 1: Right click D: drive and select “Resize/Move Volume“.

Drag to resize

Step 2: In the pop-up window, drag the left border rightwards to generate free Unallocated space.

Shrink d drive

Drag to resize

Click OK and back to the main window, where 20GB Unallocated space created behind C: drive.

Unallocated space

Step 3: Right click C drive and select “Resize/Move Volume” again, in the pop-up window, drag the right border rightwards to hold the Unallocated space.

Extend C drive

Hold unallocated space

Click OK and back to the main window, where C drive extended to 60GB by holding the 20GB free space from D. Press Apply on top left to execute, done!

Partition resized

In Summary

You can merge C and D drive with Windows built-in or 3rd party software, but the best choice is extending C drive by taking free space D, so you can change partition size and keeping everything intact.

Learn More Download to try

Leave a Reply

You must be logged in to post a comment.