How to Solve Extend Volume Greyed out in Windows 10?

June 21, 2017

When you trying to extend volume with Disk Management, you may find that the Extend Volume option is greyed out. Why is that? Can you solve it without data loss?

Disk Management is a built-in tool in Windows 10, which is able to extend/shrink/create/delete/format partition without rebooting system. It is convenient for the users to manage their partitions without the third-party partition software. Therefore most of users choose to use the tool. But you may face some problem. For instance, the Extend Volume greyed out in windows 10 when you use the tool to extend partition to solve low disk space warning problem. You may feel confused why does this happen?

You may need to extend partition, especially system partition due to the low disk space caused by caches, temporary files, or other reasons. Usually, the users would like to use Disk Management in Windows 10 to extend partition. But have you ever found that the Extend Volume is greyed out? And you cannot extend partition with Disk Management.

In fact, if you want to use Disk Management in Windows 10, you must be clear that the feature is only available when there is unallocated space adjacent to the partition which you plan to expand. Otherwise, Extend Volume will be greyed out. Just like the following pictures.

What’s more, you can’t move partition with Disk Management in Windows 10. So you probably need to delete the partition behind, and then merge partition Windows 10 with Disk Management. If you can’t satisfy the precondition, what should you do to extend partition to reduce the influence of low disk space?

AOMEI Partition Assistant Professional is specialized in partition management. This software enables you to extend partition no matter there is unallocated space adjacent to the partition you try to extend or not. And this software work perfectly on Windows 8.1, Windows 8, or Windows 7/Vista. Besides, with the friendly-use interface, you can easily finish the task. The detail steps will show you as follows.

Extend partition without unallocated space

Step1: Download AOMEI Partition Assistant Pro, install and launch it. Choose Extend Partition Wizard on the left of the interface.

Step2: Select Extend system partition and then click Next.

Step3: Choose the partition you want to transfer free space from (partition D) and then click Next.

Step4: Right move the bar to make sure how much size you want to add into system partition and click Next.

Step5: Click Proceed to perform the operations then you can extend system partition.

Extend partition with unallocated space

Before you do:

  • This operation may change the original location of your data, so we suggest you to learn the tutorial “How to Safely Partition” before executing this operation.
  • If the partition has running applications, AOMEI Partition Assistant will suggest you to close them or perform the operation under PreOS Mode.
  • Step1: Launch this software; right click the partition you want to extend (eg. partition C) and then choose Merge Partitions.

    Step2: Select unallocated space and then click Next.

    Step3: You can preview the operations, before click Apply to perform them.


  • Only 2 partitions can be merged at one time, moreover the two partitions must be adjacent. However, you can merge two or more parts of unallocated space into a partition and the unallocated space just need to be behind the partition, whether it is adjust to the partition or not.
  • You can merge data partition into system boot drive, but you cannot merge system boot drive into data partition.
  • "System Reserved" partition could not be merged.

Besides the methods mentioned above can help you solve the problem of “extend volume greyed out in Windows 10”, you can also extend partition through allocating free space from another partition to the partition you need to extend. AOMEI Partition Assistant Professional allows you to manage partitions more completely.