How to Extend C Drive with Nonadjacent Unallocated Space on Windows 11/10

Updated by

Sherly 

Updated on Apr 28, 2026

Have unallocated space on your hard drive but still can't extend your C drive? Is the unallocated space not adjacent to the C drive, making the "Extend Volume" option greyed out? It is a common issue for Windows users. In this guide, you'll learn why this happens, whether it's possible to extend the C drive with nonadjacent unallocated space, and most importantly, how to do it safely without losing data using the right tools and methods.

Can I Extend C Drive with Nonadjacent Unallocated Space?

Yes, you can extend the C: drive with nonadjacent unallocated space, but Windows Disk Management cannot do it directly. Here's why:

• Disk Management only allows extending a partition when the unallocated space is immediately adjacent on the right side of the target partition.
• If the unallocated space is separated by another partition (like D:), the Extend Volume option will be greyed out.

There are many similar cases on forums:

To extend the C drive with nonadjacent unallocated space in Disk Management, you must delete the partition in between, which erases all data on that partition. If there is a Recovery partition or EFI partition in the way, it's not recommended that you delete them since deleting critical partitions like EFI System Partition or Recovery Partition may cause boot failure or break system recovery functions.

So, the best solution is using a third-party partition software like EaseUS Partition Master to move partitions safely,  merge nonadjacent unallocated space, or extend C drive without deleting partitions or losing data

How to Extend C Drive with Nonadjacent Unallocated Space

In this part, you will get two methods to add nonadjacent unallocated space to the C drive. Based on your needs, select the proper guide to get started.

Method 1. Use EaseUS Partition Master (Recommended)

EaseUS Partition Master offers a much more flexible way to manage disk partitions than Windows Disk Management. It can extend the C drive with nonadjacent unallocated space directly, without deleting any partitions. It works smoothly on Windows 11/10/8/7. For beginners, it's easy to use, without typing any command lines or deleting any partitions.

Extend System C drive with unallocated space

1. 1. Right-click on the System C: drive and select "Resize/Move".
2. 2. Drag the system partition end into the unallocated space so to add it to the C: drive. And click "OK". 
3. 3. Click "Execute Task" and "Apply" to execute the operations and extend the C drive.

With EaseUS Partition Master, you can extend C drive without deleting partitions. If you have a backup, you can try Disk Management as mentioned in the Method 2.

Method 2. Use Disk Management (With Limitations)

Windows Disk Management can extend the C drive, but only when unallocated space is adjacent on the right side. If not, you must manually make it adjacent by deleting partitions.

Steps to Extend C Drive with Nonadjacent Unallocated Space in Disk Management:

Step 1. Open Disk Management

• Right-click Start
• Select Disk Management

Step 2. Identify Disk Layout

Locate your:

• C: drive
• Unallocated space
• Any partition between them (e.g., D:)

Step 3. Delete the Partition Between C and Unallocated Space

Right-click the partition (e.g., D:)

• Select Delete Volume
• Confirm deletion

👉 Now the unallocated space should become adjacent to the C drive. If not, repeat and delete other partitions between the unallocated space and the C drive.

Step 4. Extend C Drive

• Right-click C drive
• Select Extend Volume
• Follow the wizard: Choose available unallocated space
• Click Next > Finish

Your C drive will now successfully expand into the newly available space.

👉 If this guide helped you, consider sharing it with others who are facing the same issue!

Conclusion

Extending the C drive with nonadjacent unallocated space is possible, but Windows Disk Management has strict limitations. It only works when the space is directly adjacent, often forcing users to delete partitions and risk data loss. For a safer and more flexible approach, third-party tools like EaseUS Partition Master allow you to move partitions and extend the C drive without deleting data, making the process significantly easier and more reliable for everyday users.

FAQs About Extending C Drive but Unallocated Space Not Adjacent

1. Why can't I extend C drive with unallocated space in Windows 11?

Because Disk Management only supports extending partitions when unallocated space is directly next to the C drive on the right. If it's not adjacent, the Extend Volume option will be unavailable.

2. How to move unallocated space next to C drive?

You need to move the partition located between the C drive and the unallocated space. Windows Disk Management cannot do this, so you'll need third-party partition software like EaseUS Partition Master to safely relocate partitions without data loss.

3. How to extend C drive with unallocated space via DiskPart?

You can use DiskPart only when unallocated space is adjacent to the C drive.

Open Command Prompt as Administrator

Type:

• diskpart
• list volume
• select volume C
• extend

If the space is not adjacent to C drive on the right side, the command will fail.