If partition D is running out of space but you can't get free space from other drives in the same disk, you can move it to another disk, follow the steps:
To other data volumes that without programs or Windows services, you may ignore the step to change drive letter.
If you want to move system partition C, you need to copy entire disk, copying single C drive cannot ensure Windows bootable. Follow the steps in the video:
To move hard drive partition on Windows Server 2012 (R2), NIUBI Partition Editor helps you accomplish safely and easily, it is able to move partition to left or right in a disk, and move single or all partitions to other disk.