By Ivy / Last Updated September 26, 2021

Real case about Extend Volume is disabled

After using my computer for a period of time, my C drive is full. Thus, I decide to extend it in Disk Management. However, after I right-click my C drive under Disk Management window, all I see is Extend Volume grayed out. Are there any suggestions to fix it?

Extend Volume Is Disabled

When will Extend Volume not work properly in Disk Management?

Below is some situations Extend Volume work properly in Disk Management. See it, and then I will tell you when it will not work as usual.

1. Extend Volume only works on NTFS partition or RAW.

2. Extend Volume only works with unallocated space.

3. Extend Volume only works with adjacent unallocated space to the target partition.

4. Extend Volume only works with the right adjacent unallocated space to the target partition.

To sum up, if you want to use Disk Management to increase your partition, your target partition needs to be NTFS partition or RAW. And your unallocated space must be right adjacent to your target partition. If your partition cannot match any of these factors, Disk Management will not work as normal.

To fix it, some users try to shrink D: drive to get the unallocated space. However, you will find the unallocated space you get is right adjacent to D: drive instead of C: drive. That's to say, if there is no unallocated space before you want to extend C drive, you cannot get any available unallocated space unless you delete the next partition. If you choose to delete D: drive, you must lose your data on it.

Deleting partition is really a difficult decision for the majority of people. If you do not want to delete your partition, continue to see below and I will show you the alternative software. It will overcome the limitations in Disk Management and help you extend your partition effortlessly.

How to fix Extend Volume is disabled in Windows 7/8/10/11 for C drive?

Powerful partition manager: AOMEI Partition Assistant

AOMEI Partition Assistant Standard is a useful software that is designed for Windows users, including Windows 7, Windows 8, Windows 10, and Windows 11 etc. It can help you to solve many problems, such as Extend Volume is disabled. And it offers you various choices. If there is nonadjacent unallocated space to the target partition, you can use a powerful function called Move Partition. With it, you can move the unallocated space to the right adjacent side of your target partition. If you just want to get some unallocated space on D: drive, you can right-click it and then Resize Partition. And you still can use Merge Partition to increase your partition, even without moving or resize your partition first.

Detailed steps to fix Extend Volume is disabled for C drive

Step 1. Download and install AOMEI Partition Assistant.

Download Freeware Win 10/8.1/8/7/XP
Secure Download

Step 2. Enter the main page, right-click the target partition, and select Merge Partitions.

Merge Partitions C

Step 3. Select the unallocated space or an existing partition with free space, click OK.

Merge C And Unallocated Space

Notice: If you want to merge partitions, you are only allowed to merge two adjacent partitions every time. However, if you decide to merge unallocated space, it's quite a different story. You can merge any unallocated space on the disk.

Step 4. Preview the result and click Apply to accomplish the upcoming operation.

Apply Merge C And Unallocated Space

Step 5. Now, click Proceed and wait for the final result.

From the steps above, you can clearly see that the unallocated space is right adjacent to D drive. But you still can merge your target partition with the unallocated space or partition D. It successfully fixes the limitations of Disk Management and helps you to increase your partition effortlessly.


Extend Volume is disabled in Windows 7/8/10/11 for C drive makes the majority of people painful. In Disk Management, you cannot extend partition with FAT32, FAT16, etc. Also, you cannot extend partition without right adjacent unallocated space. But if you download the best free partition manager: AOMEI Partition Assistant Standard, you can overcome the limitations in Disk Management. And you have various choices like Move Partition, Resize Partition, Merge Partition, etc. The simplest one is to merge your target partition with unallocated space or adjacent partitions. To enjoy advanced features, including move apps from one drive to another, allocating free space, etc., you can upgrade AOMEI Partition Assistant Standard to Professional version.