How to Add Unallocated Space to System Partition (C: Drive) in Windows 7, 8, 10?

Real case about adding unallocated space to system partition

"One of my friend, he is running Windows 7, there is some unallocated space shown in Windows Disk Management. D: partition is located between C: drive (system partition) and unallocated space. As a result, "Extend volume" option is grayed out, his C: partition is running out of space and need to enlarge. So, is there any way to add unallocated space to partition without reinstalling operating system...?"

Problem analysis and solution introduction

The main reason is Windows built-in Disk Management requires adjacent unallocated space, if there is no adjacent unallocated space behind the partition you want to extend, the task can not be continued. Based on this limitation, what’s worse, Windows Disk Management could not move partition at all.
So, to solve this problem, choose some highly praised partition magic Windows 7 tools is the best choice. To some Windows 10, Windows 8.1/8, Windows 7, Vista, XP and 2000 home users, AOMEI Partition Assistant Professional could also assist them to add unallocated space to system partition easily. If your computer runs Windows Server 2003, 2008, or 2012, AOMEI Partition Assistant Server tool will be the best choice.

Guide to add unallocated space to system partition in Windows 7

• Before you follow the steps, please download AOMEI Partition Assistant Professional (PA Pro) in advance for better understanding.
• The following tutorial is based on above problem environment, if there is no unallocated space; please get detailed instruction about shrink partition Windows 7.

1. Launch AOMEI Partition Assistant to get following disk information:
2. Right click on D partition and select "Move Partition". In the pop-up window, drag D partition rightwards.
3. Click "OK". You can find the unallocated space was moved behind to C: partition. Right click on system partition and select "Resize Partition", in the pop-up window, drag right handle of C: partition rightwards to add unallocated space into partition:
4. Click "OK" to preview the changes. To save changes, click "Apply" on the toolbar. Other buttons, "Undo", "Redo" or "Discard" are used for correction. Several minutes later, you will find that adding unallocated space to system partition is done:
So, with this all-in-one and easy-to-use program, we get the best and easy method to add unallocated space to system partition for Windows 7.

Source: http://www.disk-partition.com