Software⏱️ 4 min read📅 2026-06-15

How to Fix: VERR_ACCESS_DENIED error with Virutalised existing linux partition

Virtualizing a Linux partition on a Windows host causes VERR_ACCESS_DENIED error due to disk attribute issues.

Quick Answer: Try disabling UAC and re-attaching the virtualized disk.

📋 Table of Contents

  1. 🔍 Why This Happens
  2. 🛠️ Step-by-Step Verified Fixes
  3. 💡 Conclusion

The VERR_ACCESS_DENIED error with Virtualized existing Linux partition occurs when the Linux partition is not properly configured or recognized by the VirtualBox software. This issue affects users who have installed both Ubuntu 14.04 and Windows 8.1 on their hard drive and need to virtualize their Linux partition.

It can be frustrating to encounter this error, especially when trying to access a previously functional Linux partition. However, don't worry; with the right steps and troubleshooting techniques, you can resolve this issue and regain access to your Linux partition.

🔍 Why This Happens

  • The primary cause of this error is that the Linux partition is not properly recognized by VirtualBox due to its RAW disk format. This is because the `ATTRIBUTES DISK` command may have been used incorrectly or not at all, leading to an incorrect disk attribute value being set.
  • Another possible reason for this error could be related to UAC (User Account Control) settings on Windows 7 host. Disabling UAC might help resolve the issue by allowing VirtualBox to access the RAW disk properly.

🛠️ Step-by-Step Verified Fixes

Configuring Disk Attributes in Diskpart

  1. Step 1: Open the Disk Management tool on your Windows 7 host and locate the Linux partition. Right-click on the partition and select 'Properties'. In the Properties window, click on the 'Attributes' tab.
  2. Step 2: In the 'Attributes' tab, click on the 'Disk Attributes' button and then check if the 'READONLY' attribute is set to 'No'. If it's set to 'Yes', you'll need to clear this attribute. To do so, right-click on the partition again and select 'Change Attributes'. In the 'Change Attributes' window, uncheck the 'READONLY' box.
  3. Step 3: After clearing the READONLY attribute, save your changes and exit Disk Management. This should allow VirtualBox to recognize the Linux partition properly.

Disabling UAC

  1. Step 1: Open the Control Panel on your Windows 7 host and navigate to 'User Accounts'. Click on 'Change User Account Control settings' from the left menu.
  2. Step 2: In the 'Change User Account Control settings' window, move the slider all the way down to 'Never notify'. This will disable UAC for your account. Note that this setting applies only to your account, not to the entire system.
  3. Step 3: After disabling UAC, try running VirtualBox again and see if it can access the RAW disk properly.

💡 Conclusion

To resolve the VERR_ACCESS_DENIED error with Virtualized existing Linux partition, you have two primary methods: configuring disk attributes in Diskpart or disabling UAC. By following these steps, you should be able to regain access to your Linux partition and continue using it without any issues.

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