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How to Solve "Diskpart Failed to Extend the Volume" [3 Efficient Ways]

This article explains why Diskpart failed to extend the volume and provides detailed guides for readers to fix this error. Besides, it introduces an ideal disk management tool to avoid this error.

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Updated by Oliver on Apr 09, 2024
Written by Sherly

Are you looking for a solution to fix the "Diskpart failed to extend the volume" error? We've got you! In this article, you can learn why Diskpart failed to extend the volume and three efficient ways to fix this error. But before we learn the fixes, we need to learn more about the "Diskpart failed to extend the volume" error. So let's start with what this error is.

What Is the "Diskpart Failed to Extend the Volume" Error?

Some users are used to using the Diskpart.exe utility to extend volumes, especially some Computer experts. It is a text-mode command line that supports storage objects, such as disk, partition, or volume configurations, and management from scripts, remote sessions, or direct input from a command prompt.

diskpart failed error

However, in some cases, when you perform the "Extend" command on the selected volume, you may receive error messages such as "The volume you have selected may not be extended. Please select another volume and try again." etc. Why can't DiskPart expand the volume? How can I fix it? Don't worry. You can find answers in the following content.

Also, you may also meet this error if you are using Disk Management, so we prepare a link to help you remove this error:

What Causes the "Diskpart Failed to Extend the Volume" Error?

It is very annoying when you try to use Diskpart to expand a volume and get an error. So what is the exact cause of this error? Let's explore it.

There are two main reasons for not being able to use DiskPart to extend volumes:

  • The selected volume doesn't use NTFS: Diskpart can only extend NTFS volumes, so if your selected volume is FAT, Diskpart will show this error message.
  • Insufficient space: If there is no adjacent unallocated space behind the target partition, this error may also happen.

All in all, the expansion failure is mostly due to the limitations of the DiskPart command line. Well, is there any fix that can help with the error? Sure, let's go to learn!

How to Fix "Diskpart Failed to Extend the Volume" Error - Three Efficient Ways

We have learned the reasons that lead to this error. Hence, it is time to fix this error based on the reasons mentioned above. In this part, there are three efficient ways to fix "Diskpart failed to extend the volume." Now, let's start to learn the first way. In this way, you can get a professional tool to extend the volume.

Way 1. Use EaseUS Partition Master to Extend Volume

EaseUS Partition Master Professional is an ideal alternative to Diskpart since it allows you to extend partitions with simple clicks. Besides, it doesn't need any command, so if you are not an expert in command lines, you will like it because it is much easier to use compared with Diskpart. Now, download EaseUS Partition Master and follow the steps below to perform your action.

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Step 1. Locate the Target Partition.

Go to Partition Manager, locate the target partition and select "Resize/Move".

Select target partition to extend

Step 2. Extend the Target Partition.

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

choose another drive to allocate space

Extra Option: Get Space from Another Drive

If there is not enough unallocated space on your disk, right-click on a big partition with enough free space, select "Allocate space".

Then select the target partition that you want to extend at the allocate space to column.

choose another drive to allocate space

Step 3. Execute Operations to Extend Partition.

Drag the dots of the target partition into the unallocated space and click "OK".

finish extending partition

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

Well, after this process, you have extended your volume without typing any commands. To our delight, EaseUS Partition has many other features besides extending partitions. Continue to learn more about it.

What Else Can EaseUS Partition Master Do?

As a professional and multifunctional disk management tool, EaseUS Partition Master has a lot of functions, such as:

Hence, if you are facing tricky disk issues, don't hesitate to download EaseUS Partition Master to help.

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Way 2. Convert FAT32 to NTFS Before Extending the Volume

If the volume you are trying to extend is in the format of FAT32, you can convert FAT32 to NTFS, and this command will not damage the internal data of the partition. Once this is done, you will be able to successfully extend the volume with DiskPart.

Step 1. Find the targeted drive letter. 

Step 2. Press the Windows icon key + R to open the Run box.

Step 3. Type cmd to launch the Command Prompt.

Step 4. Type help convert and then hit "Enter."

In this way, all the information about converting FAT volumes to NTFS is shown below:

help convert

Step 5. Then type convert drive: /fs:ntfs

convert to ntfs

Step 6. The last step is to type "exit" when the conversion is finished.

The file system of the target device becomes NTFS, so now, you can view and use the saved data on the drive again.

Way 3. Delete the Volume Behind Targeted Partition

If there is no adjacent unallocated space, you can delete the partition located to the right of the volume to be extended. If you want to extend your C drive, you can first delete the D partition to get an adjacent unallocated space. You will then be able to extend the volume using the DiskPart command line.

Step 1. Hit Windows Icon and R at the same time and type "Diskpart" to open it.

Step 2. Hit "Enter" every time you finish typing a command below:

list disk

select disk n (Replace n with the correct drive letter)

list partition

select partition x (Replace x with the partition number you want to delete)

delete partition

Then, you can delete the targeted partition. By the way, if you want to know other ways to delete a partition, there is a link for you:


After reading this article, you will know what to do when DiskPart cannot expand a volume in Windows 10/8/7/ XP/Vista. This article provides you with three effective solutions, and obviously, eMyPartitionMaster provides you with the most effective and easiest way to expand your volume. If you have other related questions, please continue reading the next paragraph.

FAQs About Diskpart Failed to Extend the Volume

We have discussed a lot about "Diskpart failed to extend the volume" in this article. Here, we list some other questions related to today's topic. Hope it can help.

1. Why can't I extend disk volume?

There are many possible reasons, such as:

  • Not enough unallocated space on your hard disk.
  • No contiguous free space or unallocated space behind the targeted partition.
  • Windows can only extend the Raw or NTFS partition.

2. How do I extend a volume in Diskpart?

Hit "WIN+R," type "diskpart," and press Enter to open it.

Then, hit "Enter" each time you type a command below:

  • list disk
  • select disk 1 (1 refers to the disk number)
  • list partition
  • select partition 2 (2 is the target partition number)
  • extend size=1024 (1024 is the size in MB of the targeted partition)

3. How do I extend volume with unallocated space?

You can use Disk Management, Diskpart, or third-party software to help extend volume with unallocated space. But if you are not that professional in computers, third-party software like EaseUS Partition Master is a better choice. You can easily allocate your unallocated space with the help of its prompts.

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About the Author

Updated by Oliver

Oliver is an EaseUS professional writer who dares explore new areas. With a passion for solving tech issues with straightforward guides for common users, Oliver keeps honing his writing craft by developing in-depth solutions for disk and partition management, computer boot-up issues, file transfer, etc.

Read full bio

Written by Sherly

Sherly joined EaseUS in 2022 and she has always loved writing articles and enjoys the fun they bring. She receives professional training here, focusing on product performance and other relative knowledge. She has written over 200 articles to help people overcome computing issues.

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