How to fix the Hyper-V Error applying hard drive changes

by Vladimir Popescu
Vladimir Popescu
Vladimir Popescu
Managing Editor
Being an artist his entire life while also playing handball at a professional level, Vladimir has also developed a passion for all things computer-related. With an innate fascination... read more
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Some users have encountered the Hyper-V error applying hard drive changes whenever they tried modifying the settings for their VM.

People are feeling a lot of frustration regarding this issue. Not being able to modify your Virtual Machine settings will mean that you are stuck with the original setup of your VM.

Here is what one user had to say about this problem on the Microsoft blogs:

When I try and attach a virtual hard disk to a generation 2 virtual machine – I get an error message that says ‘Error applying Hard Drive changes

This can create even more issues if you need to update the RAM capacity of your VM in order to make it run properly.

Let’s see how what you can do about this issue. Please follow the methods in this list carefully to avoid causing any other complications.

Here is what you can do to fix the Hyper-V Error applying hard drive changes

1. Make sure no other VMs are using the same hard drive

hard disk - Hyper-V error applying hard drive changes
This method applies in the case that you’re using multiple VMs from the same host machine.

Please check the virtual hard-drives linked with each of your virtual machines to make sure that there’s no conflict between them.

  1. Open Hyper-V Manager.
  2. Select the host machine that you want to check the hard-drive of -> right click it -> select Hyper-V Settings.
  3. In the newly opened window -> check the location of your virtual HDD (click Browse to modify it if needed).

2. Check if any antivirus or backup software is locking the HDD

hard-drive - Hyper-V error applying hard drive changes
The exact steps to try this method will vary depending on what antivirus or backup software you’re using. Nonetheless, make sure that you whitelist your virtual HDD inside the software.

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3. Change ISCSI Controller or IDE Controller settings

laptop on desk with notepad - Hyper-V error applying hard drive changes

  1. Open your Hyper-V Manager.
  2. Right-click the host machine -> select Hyper-V settings.
  3. Under the section SCSI Controller from the right-side menu -> right-click the HDD -> choose Properties.
  4. Click the drop-down menu under the Controller section -> choose another option (depending on what your default setting was, the exact options will vary).

4. Remove and re-add DVD drive from Hyper-V VM

DVD drive - Hyper-V error applying hard drive changes
To remove:

  1. Open Hyper-V Manager.
  2. Click Start -> Administrative Tools -> click Hyper-V Manager.
  3. Under the virtual machine name, inside the Action panel -> click Settings.
  4. Select the DVD drive from the left-side panel.
  5. Click Remove on the DVD Drive window.
  6. Click Ok.

To re-add:

  1. Inside your VM settings -> click the SCSI Controller option.
  2. Select DVD Drive from the options to your right.
  3. Click Add to complete the process.


In this guide, we explored the best options available to sort the Hyper-V not applying hard-drive changes issue. We hope you found this guide helpful.

Please feel free to let us know if this guide was of use to you by leaving a comment.

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