Software⏱️ 4 min read📅 2026-06-11

How to Fix: Installing Chromium OS on USB throws error

Error installing Chromium OS on USB due to permission denied. Fix: Ensure correct USB drive and format.

Quick Answer: Use a different USB drive with the correct Fat 32 format.

📋 Table of Contents

  1. 💡 Why You Are Getting This Error
  2. 🔧 Proven Troubleshooting Steps
  3. ✨ Wrapping Up

The error 'failed to open the USB stick, Permission denied' when trying to install Chromium OS on a USB drive using the Image Creator on OS X 10.8.2 Mountain Lion can be frustrating for users who want to create a bootable USB for their netbook. This issue is usually caused by the lack of write access to the USB device.

This problem can be particularly annoying because it prevents users from completing the installation process, leading to wasted time and effort. In this guide, we will walk you through two methods to resolve this issue and create a bootable USB for Chromium OS.

💡 Why You Are Getting This Error

  • The primary reason for this error is that the Image Creator does not have sufficient permissions to write to the USB device. This can occur when the user running the Image Creator does not have administrative privileges or the USB device is not properly recognized by the system.
  • An alternative cause could be that the USB device is not properly formatted, which may lead to issues with write access.

🔧 Proven Troubleshooting Steps

Granting Administrative Privileges

  1. Step 1: Open the 'About This Mac' window and click on the 'System Report' button. Look for the 'USB' section and find the device that you are trying to install Chromium OS on. Take note of the device's ID.
  2. Step 2: Open the 'Terminal' application and type the following command: `sudo diskutil list` to list all the available devices. Find the device with the noted ID and verify its name. Then, type the following command: `sudo diskutil unmountDisk /dev/diskXsY` where X and Y are the numbers corresponding to your USB device's partition.
  3. Step 3: Once the device is unmounted, you can proceed with formatting it using the 'Disk Utility' application. Erase the device by selecting it in the Disk Utility window, clicking the 'Erase' button, and then choosing the 'Quick Erase' option.

Formatting the USB Device Manually

  1. Step 1: Open the 'Disk Utility' application and select the USB device that you want to install Chromium OS on. Click the 'Erase' button and choose the 'Quick Erase' option.
  2. Step 2: In the 'Erase Options' window, make sure that the 'Format' is set to FAT 32 and the 'Security Options' are set to 'None'. Then, click the 'Erase' button to format the device.

✨ Wrapping Up

To resolve the error 'failed to open the USB stick, Permission denied' when trying to install Chromium OS on a USB drive using the Image Creator on OS X 10.8.2 Mountain Lion, you can try granting administrative privileges or formatting the USB device manually. By following these steps, you should be able to create a bootable USB for Chromium OS and successfully complete the installation process.

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