All disk partitions are allocated while installing Windows Operating System or obtained from server manufacturers. With right management tool, you can create, delete, resize, move and merge partitions, etc. When system C: drive is getting full, many people ask whether it is possible to merge C and D drive, so free space in drive D will be transferred into C drive.
Actually, yes you can combine C and D drive together, but if you want to extend system C drive, you'd better resize partition instead of merging volumes. In this article, I'll show you 2 ways to merge C and D drive in Windows Server 2019 and better method to resize disk partition.
Windows Server 2019 Disk Management utility has no "Merge Volume" functionality, but there is still a way to combine C: and D: drive without any software.
Drive D will be removed no matter you use Windows built-in or third party software. If you installed programs or some Windows services in it, do NOT merge drive D into C. If you can remove D drive, remember to transfer files to other place.
Steps to merge C and D drive in Windows Server 2019 Disk Management:
If your system disk is MBR, your D drive must be Primary, otherwise, Disk Management cannot merge D to C after deleting. Because Extend Volume function can only merge Unallocated space to the left contiguous partition, Disk Management can only merge D to C or E to D, it cannot merge D to E or E to C.
With partition editor software, there are no such limitations. You can merge NTFS and FAT32 partitions, or merge Primary and Logical partitions together. To do this, only several clicks are needed. The most important, all files in drive D will be moved to C drive automatically after merging C and D drive.
How to merge C and D drive in Windows Server 2019 with partition editor:
After merging D to C drive, open C: drive in File Explorer and you'll see a folder named as D to C(date_time). All files in original drive D will be moved to this folder automatically.
You'll lose D drive after merging it to C drive, no matter you use Windows Disk Management or partition editor software. If your D drive is Primary and you can remove it, you can combine volume D to C with either tool.
As I said in the beginning, if you want to expand system C drive, you'd better resize partitions instead of merging. With NIUBI Partition Editor, you can shrink D or other volume, part of free unused space will be changed to Unallocated, and then add Unallocated space to C drive. In this way, you won't lose any partition, Operating System, programs and anything else keep the same with before.
Follow the steps to expand C drive with free space on other partition(s):
When there's available free space on the same disk, there's no difference to shrink and extend partition, no matter you use single hard disk, any types of hardware RAID arrays or virtual machine in Hyper-V/VMware.
Besides shrinking, extending and merge partitions, NIUBI Partition Editor helps do many other operations such as copy, move, defrag, convert, hide, wipe, scan bad sectors.