Extend System Partition in Windows 10 without Data Loss or Reboot

June 23, 2017

Is your C: drive in Windows 10 getting full? Besides cleaning up C: drive disk space, you can also extend system partition without data loss to solve this problem.

As the user of Windows 10, have you ever been warned by Low Disk Space message on your computer? Why does this happen? The main reason is that there isn’t enough free space on your system drive. When this problem occurs, you can find that the performance of your computer isn’t as good as before. On the other hand, it will make have bad mood for work, which may directly affect your working efficiency.

When facing the problems, common users will choose to uninstall applications to release space. However, with time goes by the increasing data, cache or temporary files in your computer will still cause the same problem. To really solve the problem, it is necessary to extend system partition for Windows 10.

Enlarge C drive via Disk Management

For extending C drive, the most common way can be Disk Management, which is a Windows built-in tool. Check out the steps given below to realize how to enlarge partition C in Windows 10 via Disk Management.

1. Right click This PC and go to Management > Disk Management under Storage menu.

2. Right click system partition, choose Extend Volume and do as following prompts to extend partition.

But this way works only when there is an unallocated space very behind C drive, if there is no such unallocated space, you’ll find that "Extend Volume" greyed out.

Is there something wrong with the tool? Actually, there is nothing wrong. The fact is that the function of "Extend Volume" in Windows 10 is only available when there is unallocated space behind system partition. 

In such condition, if you have to increase capacity of C drive, you can delete the partition very behind C drive to get such unallocated space.

If your hard drive was initialized as master boot record (MBR) partition style, you cannot add unallocated space in extended partition to a primary partition. Similarly, you cannot extend a logical partition with unallocated space.

Furthermore, Disk Management can’t move the unallocated space freely. So Disk Management is not always suitable for you.

Extend System Partition via AOMEI Partition Assistant Professional

When you cannot use Disk Management to extend partition in Windows 10, you can use free partition manager software to extend C drive without data loss. AOMEI Partition Assistant Professional is a tool devoted to partition management. It owns a function named Extend Partition Wizard, which allows you to extend C drive without data loss or reboot. Let’s see how it works:

Warning: Before you do, you should make sure that there are no running programs on the system partition. Do not forcibly terminate the tasks or cut off the power when you extend system partition.

Step 1. Install and open the software, select Extend Partition Wizard on the left bar.

Step 2. Choose Extend system partition and then click Next. You can also use the Resize Partition feature to shrink and extend partition without data loss.

Step 3. Choose the partition you want to take free space from (eg.D partition). Then click Next.

Step 4. Move the bar to decide the size you want to extend and then click Next.

Step 5. Click Proceed to perform the operation, if you think all your operations are ok.

Note: Above steps can be applied to extend system partition in Windows 7 and 8 as well.

Besides this method, you can also directly merge disk partition in Windows 10 by using the feature Merge Partitions. For home users, only with the simple steps mentioned above, you can extend system partition in Windows 10 by the free software AOMEI Partition Assistant Standard without losing data and restarting your PC. Besides this edition, there is Server Edition for Server users; Technician Edition fortechnical service providers. You can always choose the most suitable one for you.