By Teresa / Last Updated December 19, 2016

Problem of adding unallocated space to system partition

With increasing files and programs in your system drive C, the capacity becomes a problem for you. In this case, you may want to make full use of the unused space from other drive. Thus, the built-in Disk Management tool is your choice to help extend system volume. In Disk Management, right-click C drive and click “Extend Volume” and you are able to enlarge system drive. However, if the unallocated space is non-adjacent to system partition, you’ll find “Extend Volume” in the given options is greyed out. What would you do now? Would you like to backup all data and format the hard drive, and then reinstall the operating system to reallocate it? Or, would you like to backup in-between partitions, delete them to extend system volume? Definitely, the answer is "No", because it is too complicated. This is way too time-consuming and complicated.

Is there any way to add unallocated space to system partition (C drive) in Windows XP/7/8/10 without reinstalling the OS? The answer is "Yes". With free partition magic Windows 7, users of Windows personal operating systems (both 34bit and 64bit) can easily move non-contiguous space to system drive.

Steps to add unallocated space to system partition in Window 7

Based on the problem above, here are the steps for you to completely solve it. Before doing all the procedures below, please first download AOMEI Partition Assistant.

Step 1: Install and launch AOMEI Partition Assistant. In the main interface, right click the partition that between system partition C and the unallocated space. Select “Move Partition” and you’ll have following pup-up window in sight. Drag it rightwards and click "OK".

Move Drive

Step 2: You will find the unallocated space is right behind drive C. Right click C: and select "Resize Partition". Drag the sidebar rightwards to add the unused space into drive C. Then, select "OK".

Step 3: You can preview the changes in the window. Confirm the change and click "Apply" on the toolbar. If not, choose "Undo" or "Discard" to do the correction. After you select "Apply", another window will show up. Click "Proceed" and the system will ask you if you are sure.

Successful Operations


  • It may require restarting the OS because system files have involved in.

  • Alternatively, you can select “Merge Partitions” in the very first step and check C drive and unallocated space in the pop-up window. You can learn more in how to allocate unallocated space in Windows 7 for detail.

  • If there is no unallocated space on the hard drive, you can allocate free space to system drive from other partitions directly via AOMEI Partition Assistant Professional.

It takes you just a few minutes to add unallocated space to system partition and the system don't need to reinstall. Meanwhile, it supports other features, like copy/extend/shrink/merge partition and so on. It is the quickly way to extend system volume. So, why don't you download it to experience all the features?