So users only need to click Next button to continue. Step 2: In this interface, users can find the software has specified the selected partition to be expanded already. Right click source partition and click Merge from the drop-up menu.Then, click Merge from the drop-down menu. Select the source partition and click Partition from the menu bar.Select the source partition and click Merge Partition from left action panel.Step 1: Choose a preferred way to start partition merging operation from the listed ones: Tip: To merge C drive and D drive in Windows 10/8/7, it is recommended that users create a MiniTool bootable media first, use it to boot computer then, and combine D drive into C drive finally in the boot mode.