
Go back to the main interface where you can preview the operation result. Here I choose C: as the destination partition. In the pop-up window, determine the size of free space that you want to reallocate from partition D and this free space will be added to the target partition. On the home interface, right-click the partition that has enough space and choose “Allocate Free Space”. Now, let’s see how to use the software to extend system volume. It can directly reallocate unused space from one partition to another partition (like from D partition to system partition) in Windows 11, 10, 8, 7. Thus, a feature-rich and powerful partition software, AOMEI Partition Assistant Professional is recommended. Note: You may be interested in: How to Make Unallocated Space Contiguous to Extend Partition Successfully? Even you get unallocated space after shrinking partition D (the partition behind system), Windows 10 Disk Management Extend Volume option is still greyed out, as the following screenshot: In many cases, the disk has no unallocated space existing for extending system partition. Allocate free space from one partition to system partition on Windows 10/11 There are two easy and reliable ways about how to increase system partition C capacity presented. Two ways to extend system partition on Windows 10 To avoid the potential problems, it’s wise to extend system partition before it is almost full.

What’s more, you can be disturbed by Low Disk Space warning. If C drive is running out of space, issues such as app slow to respond, Windows update failure may occur. Windows 10/11 System partition (C drive) is an essential partition. Question from Why extend system partition on Windows 10/11?

But “Extend Volume” is disabled, how can I extend my system partition in Windows 10?” There are two partitions: C and D on the hard drive. “Need to increase Windows 10 system partition.
