Extend Volume Option Is Greyed Out in Windows 7/8/10

Jean updated on May 28, 2020 to Partition Master | How-to Articles

This page explains why is the "Extend Volume" option greyed out on Windows 10/8/7 and offers practical solutions to help you get rid of this issue so as to extend, resize partitions with ease.

Method 1. Extend Partition Even When "Extend Volume" Greyed Out
Method 2. Extend Volume with Disk Management Alternative
Method 3. Manually Extend Partition using Disk Management
Method 4. Make "Extend Volume" Available by Formatting Unsupported Partition

Why Is "Extend Volume" Option Greyed Out

Some of you probably had the experience that Windows Disk Management works faultlessly in managing hard drive volumes at times, however, sometimes it does not.

One of the commonly seen problems is that the "Extend Volume" option greyed out. For the case of unavailability of extending a volume or a partition, we've figured out why you can't extend a volume by using disk management in Windows 10/8/7, etc.

extend volume is greyed out in disk management

To troubleshoot the extend volume greyed out issue, check out the causes first. The following are major causes that preventing you from extending partitions in Windows Disk Management.

1. No unallocated space on your computer hard drive.

2. The unallocated space is not behind the partition you want to extend.

3. The target partition file system is not supported or not recognized by Windows, such as FAT, EXT partitions.

Windows Disk Management (including Windows 10/8.1/8/7) only works to create, extend, and shrink an NTFS partition. 

4. There is no unallocated space or no continuous unallocated space behind the volume on Dynamic disk.

Method 1. Extend Partition Even When "Extend Volume" Greyed Out

Applies to: Directly extend a partition with unallocated even when the Extend Volume option is greyed out in Disk Management. 

When the "Extend Volume" option is greyed out, you may have a problem to increase or enlarge a partition by using Windows Disk Managemen. But it's not the end of this story. In this part, you will uncover three practical solutions to directly increase your partition size.

Here, we find you a perfect free alternative. EaseUS Partition Master Free helps resize partition without any hassle. 

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 Windows 10 is supported

This partition manager can extend system partition, primary partition, FAT partition, NTFS partition without any obstacle even when there is no unallocated space on your computer.

Tutorial: Extend Volume with Unallocated Space

Follow the steps below and learn how to increase a partition when there is no unallocated space or continuous space behind. We'll take extend C drive as an example to show you the complete process:

Step 1: Launch EaseUS Partition Master

Run EaseUS Partition Master

Step 2: Add space to the System C drive

1. Shrink partition and leave unallocated space for extending C: drive:

  • Right-click on a partition next to the C: drive and select "Resize/Move".
  • Drag the end of the partition that is next to the C: drive and shrink it, leaving unallocated space next to the system C: drive, and click "OK".

2. Right-click on the System C: drive and select "Resize/Move".

Extend System partition

To add space to the C: drive, drag the system partition end into the unallocated space.

Add space to C drive

Step 3: Confirm to extend system C drive

Click the "Execute Operation" button, it will list the pending operations, and click "Apply" to execute the changes and extend the C drive.

Confirm to extend system C drive

Method 2. Extend Volume with Disk Management Alternative

Apples to: Increase partition size without unallocated even though "extend volume" greyed out on the computer using Disk Management alternative. 

EaseUS Partition Master is a perfect Windows Disk Management alternative tool. If there is no unallocated space at all on your computer, and you don't want to delete a volume or manually shrink an adjacent partition, let EaseUS Partition Master Professional help.

You can flexibly move free space from one partition to your target partition with its Allocate Space feature using this software. No data loss nor complex operations.

Follow the steps here to extend volume without using Disk Management:

Step 1. Locate the Target Partition

To start extending partition, you should first launch EaseUS Partition Master and locate the target partition which you would like to extend.

Step 2. Extend the Target Partition

1. Right-click on the target partition which you would like to extend and select "Resize/Move".

Select target partition to extend

2. Drag the partition panel rightward or leftward to add unallocated space into your current partition and click "OK" to confirm.

choose another drive to allocate space

3. If there is no or not enough unallocated space on your disk, use the advanced partition resizing function to directly allocate free space from other partitions to the target drive without deleting or formatting.

Find the "Allocate XX space from" option, then click "Select partition". Choose the partition from which you want to allocate space. Drag the partition panel rightward or leftward to resize the partition you want to extend. Then click "OK" to confirm.

choose another drive to allocate space

Step 3. Execute Operations to Extend Partition

Click the "Execute Operation" button and click "Apply" to keep all the changes. 

finish extending partition

Method 3. Manually Extend Partition using Disk Management

Applies to: Make "Extend Volume" available and increase partition size in Disk Management by deleting or shrinking volume.

The other way that works to fix the "Extend Volume" not available error on Windows computer is using Disk Management to delete or shrining a neighbor partition.

Step 1. Open Disk Management by right-clicking "This PC" or "My Computer" >"Manage" > "Disk Management".

Step 2. Create an unallocated space behind the target volume.

If the partition behind your target volume is not empty but contains large free space, right-click on it and select "Shrink Volume" so as to free up a certain amount of space.

Shrink volume

If the partition behind your target volume is empty, right-click on the partition and select "Delete Volume", click "OK" to confirm.

Delete Volume.

Step 3. Extend the target partition by right-clicking on it and select "Extend Volume".

The "Extend Volume" option should be able to work by now.

Extend Volume

Step 4. Follow the onscreen instructions and finish the extending partition process.

Method 4. Make "Extend Volume" Available by Formatting Unsupported Partition

Applies to: Make the Extend Volume option available in Disk Management by formatting unsupported partition to a compatible format.

If your computer volume displays as RAW, FAT, EXT, exFAT, Windows Disk Management won't work on them. Extending or shrinking volume options will not be available.

The best way to thoroughly resolve this issue is to format your target volume to a recognizable file system, such as NTFS. Here we'll use EaseUS Partition Master Free to help you out. It will detect and format all unsupported file system to a recognizable one for Windows PC:

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 Windows 10 is supported


Step 1: Run EaseUS Partition Master, right-click the hard drive partition you intend to format and choose "Format".

Format Hard Drive Partition - Step 1

Step 2: In the new window, set the Partition label, File system (NTFS/FAT32/EXT2/EXT3), and Cluster size for the partition to be formatted, then click "OK".

Format Hard Drive Partition - Step 2

Step 3: Then you will see a warning window, click "OK" in it to continue.

Format Hard Drive Partition - Step 3

Step 4: Click the "Execute Operation" button in the top-left corner to review the changes, then click "Apply" to start formatting the partition on your hard drive.

Format Hard Drive Partition - Step 4

After this, you can retry to extend the target volume using Disk Management again. If Disk Management doesn't work, revert to Method 1 or Method 2 and apply EaseUS Partition Master for help. It won't let you down.


On this page, we covered 4 practical methods to help you resolve the "Extend Volume" greyed out issue on Windows 10/8/7. No matter what causes this issue, you can all easily increase a partition size with or without unallocated space using EaseUS Partition Master.

If you prefer a manual way, Disk Management with Method 3 will help. Note that the provided solutions also work to fix extend volume greyed out issue on Windows Server 2016/2012, etc.

No matter what reason stops you from extending partition, apply the four methods on this page to help yourself out.

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Frequently Asked Questions

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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.

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Video Tutorial

How to Partititon a Hard Drive on Windows 10/8/7