#1 Global Leader in Data Protection & Ransomware Recovery

Error “Unexpected VHD Feature Mask ‘6’” on Hyper-V backup or replication job

KB ID: 1742
Product: Veeam Backup & Replication
Version: 6.x, 7
Published: 2013-03-26
Last Modified: 2020-08-13
mailbox
Get weekly article updates
By subscribing, you are agreeing to have your personal information managed in accordance with the terms of Veeam's Privacy Notice.

Cheers for trusting us with the spot in your mailbox!

Now you’re less likely to miss what’s been brewing in our knowledge base with this weekly digest

error icon

Oops! Something went wrong.

Please try again later.

Challenge

The feature mask 6 error is Hyper-V specific. This KB covers that error and how to resolve it.

Cause

Feature mask 6 errors most often occur when a Hyper-V VM was a Physical to Virtual conversion using third party software. The issue is that some third party converter software creates the VHD/VHDX as a virtual hard disk with a Feature Mask of 6. This is not a feature mask recognized by Hyper-V and thus cause issues.

This is how the error presents itself:
 

User-added image


User-added image


User-added image

Solution

To resolve this issue, convert the disk from Fixed to Dynamic or vice-versa (then convert back to what you had been using).

If you are you using  server 2012 host environments ONLY, you will need to convert the disk to a VHDX format (from the older VHD).

Both of these methods essentially create brand new VHD files, and move the data from the old VHD to the newly created one. This sets the proper VHD information and should resolve any related errors.

To submit feedback regarding this article, please click this link: Send Article Feedback
To report a typo on this page, highlight the typo with your mouse and press CTRL + Enter.

Spelling error in text

This site is protected by reCAPTCHA and the Google Privacy Policy and Terms of Service apply.
Thank you!

Thank you!

Your feedback has been received and will be reviewed.

Oops! Something went wrong.

Please try again later.

You have selected too large block!

Please try select less.

KB Feedback/Suggestion

This form is only for KB Feedback/Suggestions, if you need help with the software open a support case

By submitting, you are agreeing to have your personal information managed in accordance with the terms of Veeam's Privacy Notice.
This site is protected by reCAPTCHA and the Google Privacy Policy and Terms of Service apply.
Verify your email to continue your product download
We've sent a verification code to:
  • Incorrect verification code. Please try again.
An email with a verification code was just sent to
Didn't receive the code? Click to resend in sec
Didn't receive the code? Click to resend
Thank you!

Thank you!

Your feedback has been received and will be reviewed.

error icon

Oops! Something went wrong.

Please try again later.