Extend NTFS System Partition Without Restarting Computer?

When do you need to extend NTFS system partition?

After running Windows 10/8/7 for a while, your system partition may get low disk space because of system files, installed software, and updates. When system NTFS partition gets full, many things will be slow and you are starting to receive errors. In this case, you need to either delete some files on system partition or extend the system partition using the space on the hard drive. You must be very careful when you delete files on the system drive because it will result in being unable to load your Windows system to delete some essential system files. You can use Disk Cleanup to delete some unwanted non-crucial files located on C: drive. However, if that is not enough and you don’t want to mess up with system files, then you have to extend the system volume.

Can you use Disk Management to extend system partition?

As you know, Windows built-in utility Disk Management has the ability to increase partition size. However, there are some limitations in it regarding extending partition size, which is why people usually see that the extend volume grayed out. In order to expand system partition in Disk Management, there has to be unallocated space right behind the system partition. Even if you shrink another partition, the unallocated space will not be contiguous to the system partition. Since Disk Management does not have the ability to move partition, it is unable to extend system partition using the unallocated space that was generated by shrinking another partition. The only way to extend system partition in Disk Management is to delete the partition behind C: drive, mostly D: drive. Therefore, if you do not want to lose a whole partition to extend C: drive, you can use third party partition manager software AOMEI Partition Assistant to do it without any data loss.

How to resize NTFS partition with AOMEI Partition Assistant?

Freeware AOMEI Partition Assistant Standard can help you to resize NTFS partition or FAT32 partition without data loss. With the ability to move partition, you can use the unallocated space anywhere on the same disk to extend system partition.

To extend system partition without AOMEI Partition Assistant:

1. Download and then launch Partition Assistant. The following is the situation of the disk.

2. Right click the partition D: and select the menu "move/resize" option.


3. In the Resize and Move dialog, move the mouse pointer to the left edge of the partition. Please drag the mouse to change partition size when the mouse pointer changes to a double-headed arrow.


4. Right the drive C:, and select the menu "Resize" option, which will open the following dialog. You need to move the mouse pointer to the left edge of the partition, and drag mouse to change drive C: size when the mouse pointer changes to a double-headed arrow.


5. Click the "Apply" on the toolbar, and click "Proceed" to extend NTFS system partition with no required reboot computer.


In a short while, the C: drive will be extended. Besides the ability to extend NTFS system partition, AOMEI Partition Assistant also allows you to convert MBR to GPT disk without data loss, migrate OS to SSD, create bootable media, and more.