Can't Extend Volume or Extend Volume Greyed Out in Windows? Fix It Now!

Brithny updated on Feb 24, 2020 to Partition Master | How-to Articles

Page Content:

1. Why is Extend Volume grayed out
2. How to extend volume with unallocated space

Q: Can't extend partition into unallocated space, how to fix?

"Hi there, do you know how to fix the problem that Extends Volume option in Disk Management is greyed out? I planned to expand my system C drive to speed up the computer with Windows 10. I opened the Disk Management tool, deleted an extended partition to leave unallocated space so to extend C drive? But it won't allow me to do so. Why? The Extend Volume option is greyed out, and how can I fix this issue?"

Cannot extend volume partition.

Are you having the same issue on your PC that the Disk Management tool won't allow you to extend volume? Relax! Reading this tutorial, you will know why is Extend Volume grayed out. Besides, effective solutions are available right here to help you fix this issue and extend partition in Windows 10 for free now. How? Let's see.

Prior note: It's impossible to extend or add partition space with free space on a second disk. Therefore, please make sure that the free space or unallocated space and the volume which you want to extend are on the same disk.

Why Is Extend Volume Grayed Out

If you can't extend volume, like cannot extend C drive, you can learn the causes of the problem in advance.

  • There is no unallocated space on your hard drive.
  • The partition you want to extend is a FAT partition. The Extend Volume option in Disk Management only works to a RAW or NTFS partition. You can convert FAT to NTFS using CMD or partition manager.
  • There is no contiguous unallocated space or free space behind the partition you want to extend. 

Now that we know why is Extend Volume grayed out, let's start solving the problem.

Method 1. Extend Volume in Disk Management

In order to extend a volume using Disk management, ensure that your computer can meet the two conditions below.

1. Make Sure Free or Unallocated Space in PC

If you don't have free space or unallocated space on the computer, you must first delete an empty or useless partition to leave free/unallocated space for extending volume.

2. Make Unallocated Space Contiguous to the Target Partition 

When the unallocated space is not right behind the volume partition, which you need to extend, you'll not be able to extend it then. And the Extend Volume option will be greyed out. Therefore, your best choice is to delete the partition right behind the volume, which you need to expand. In this way, you can extend it then.

If you have already deleted partition, but the unallocated space is not right behind the volume, and the volume next to the target partition cannot be deleted, how do you extend volume on the C drive? Don't fret, use Method 2 to troubleshoot.  

Method 2. Fix Can't Extend Volume with Free Partition Manager

Here in this method, we'd like to recommend you try a free and powerful partition manager software - EaseUS Partition Master Free that supports you to free extend or increase partition size and fixes Extend Volume Greyed Out the issue with ease. 

If you have unallocated space on your disk, you can use this tool to extend partition, either to the left or right of the current partition. If there is no unallocated space on your disk, you can remove or shrink partitions to make unallocated space, and then expand the partition, such as extend C drive with unallocated space.  

Now, free download and install EaseUS Partition Master on your PC, then follow the below steps to fix can't extend volume problem.

Download Now

 Windows 10 is supported


Step 1: Locate the drive/partition

Which drive/partition do you want to adjust its size? Right-click on it and choose "Resize/Move".

choose the partition

Step 2: Resize the partition

You can either shrink the selected partition or extend it.

To shrink the partition, simply use your mouse to drag one of its ends into unallocated space. Expand the "Advanced Settings" list, where you can see the exact disk space for each partition. Once done, click "OK".

Fig. 1 Unallocated space before the drive.

drag the mouse leftwards to resize partition

Fig. 2 Unallocated space after the drive.

drag the mouse rightwards to resize partition

To extend the partition, make sure that there is unallocated space aside (if there isn't, follow the above steps to create some). In the same way, drag your mouse towards the unallocated space. Click "OK".

Fig. 3 Add unallocated space into the partition

drag the mouse towards unallocated space

Step 3: Apply changes

At this step, you will see the new disk partition information & diagram.

disk partition information after resizing

To save changes, click the "Execute Operation" button and then "Apply".

apply changes to the partition

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Frequently Asked Questions

Why Choose EaseUS Partition Master?

"I've used Partition Master Professional many times to create, delete, format, move, rename, and resize partitions."PCWorld

"Partitioning tools have come a very long since the days of complicated command line utilities and EASEUS Partition Master is one of the most advanced programs available."TECH ADVISOR

"I love that the changes you make with EaseUS Partition Master Free aren't immediately applied to the disks. It makes it way easier to play out what will happen after you've made all the changes."Lifewire

Will the "Migrate OS" feature transfer the Windows system files only or the whole C drive?

To ensure that the migrated system will boot normally, the Migrate OS feature will transfer all the files in the system and the boot partitions. Generally, the boot partition is the C drive so the transfer will include all the files in C.

Does EaseUS Partition Master license apply to multiple computers?

The license of Partition Master Professional and Server editions can be used on 1 computer only, while that for for the Technician and Unlimited editions can be used on multiple machines.

What is the difference between EaseUS Partition Master Trial version and the Free version?

Free is for home users only, with most basic functions available such as partition resize and clone. While trial can help you understand how this product works and test what a full license can do on a business or server OS machine.

Will it cause any data loss after resizing the partition in EaseUS Partition Master?

Generally, it will not cause any data loss or boot issue by resizing a partition. However, in order to protect your data, we suggest that you backup the partition before resizing, in case of any unexpected situations such as power outages, computer hardware failures, etc. You can use EaseUS Todo Backup to backup the partition and its trial version is fully functioned for 30 days.

What should I prepare before resizing the partition?

On the partition that is going to be operated, there might be some files being occupied by other programs. To ensure a successful operation, we suggest that you close all the unnecessary software before resizing that partition. Otherwise, EaseUS Partition Master will detect the partition being locked by the other software and require a reboot to resize the partition under boot mode.

About EaseUS Partition Master

All-round disk & partition management software for personal and commercial use. Let it manage your storage drive: resize, format, delete, clone, convert, etc.