This article tells ways to merge c and d drives without losing data with free tool Partition Resizer.
Answer: Yes, it's no data losing to combine drive C and D with 3rd party free tool Partition Resizer which has the function of merging adjacent two volumes without data loss.
Note: System drive is always set as the target drive for the merging. If the C drive is the system drive, c and D merging will be merged to the system C drive.
Merging c and d drives with Windows built-in tools is data erasing since it needs to remove D drive as a comdition. (You may backup data on drive D, and delete D later for a secure space merging with Disk Management.)
3rd party free tool Partition Resizer can help merge c and d drive into c drive on Windows 11/10/8/7 without losing data.
Question: is it safe to merge c and d drive?
Answer: Yes, it's safe to merge c and d with free tool Partition Resizer which ensures a 100% roll-back guarantee without data loss. (Windows built-in tools will erase data if you want to merge c and d).
This following table shows simple and straight overview of merging c and d volumes.
Step1: Install IM-Magic Partition Resizer free on your computer, run the program, you will see all the partitions of your disk listed.
Step2: Choose the partition 1 you want to merge, right click it and choose “merge partition” option,
It will pop out a window, you can choose c drive and its adjacent D drive to get them merged into C drive. This following image displays the merging of c and H as an example. Here this step, you need to select C and D drive.
Merge drives in Windows 11/10/7 with freeware
Note: If you want to merge c and D drive into D drive when the D drive is the system partition, you need to select "Merge selected volume to D" in the above image. The volumes can only be merged into the system drive, no matter it's c or D.
The question: how to change local disk c to d in Windows 10/11?
Answer: If c drive is the system partition, you can merge c and d into c drive, if d drive is the system partition, you can merge c and d into d drive.
Note: If you want to change the c drive into another drive letter D, you may right click C -> Change drive letter, and change it to drive letter D in the free tool Partition Resizer.
Step3: Apply changes.
Then you will have a large c drive without data loss.
Also read: how to merge two partitions
Question1: How do I merge two hard drives in Windows 11/10/8/7 from different disks?
Answer: Software built RAID is recommended if you want to combine two disks or merge two disks into one.
You need to delete the D drive if you want to merge C and D drive space into one with Disk Management.
Step 1: Enter Disk Management by Right clicking THIS PC on your desktop -> Manage -> Disk Management
Step 2: Right click drive D -> Delete volume, and confirm the deletion
Step 3: Choose the local drive C you want to extend, right click it and choose to “Extend Volume”.
Step 4: It will pops out a window and asks you to choose a unallocated space, you can merge these two drives.
Merge partitions with disk management tool
It's only possible when the drive D is the system drive that you can merge C into D drive with free tool Partition Resizer.
Note: Disk Management or diskpart.exe will not allow you to merge c to D either when the c is the system partition.
It's possible to change the drive letter C to D with free tool Partition Resizer.
Note: D shall be available in your computer when no other volumes use the drive letter D. If some other drive is using the drive letter D, you should change the D drive to some other drive letter at first.
Here are the steps to change drive letter c to D.