Problem Ejecting (UAS) Mass Storage Device

The error message you are encountering, "Windows can't stop your 'Volume' device because a program is still using it," typically indicates that some process is still accessing the hard drive, preventing it from being safely ejected. Here are some steps you can take to resolve this issue:

1. Close Applications: Ensure that all applications that might be using files on the external hard drive are closed. This includes file explorers, media players, or any other software that may access the drive.
2. Check Background Processes: Sometimes, background processes can hold onto files. You can open Task Manager (Ctrl + Shift + Esc) and check for any processes that might be using the drive. If you identify any, you can end those tasks.
3. Use "Safely Remove Hardware": After closing applications, try using the "Safely Remove Hardware" option again. If it still fails, you may need to restart your computer, which can help release any locks on the drive.
4. Device Manager Check: If the problem persists, check Device Manager for any issues with the device. You can access Device Manager by right-clicking the Start button and selecting it from the context menu.
5. Uninstall and Reinstall the Device: In Device Manager, you can try uninstalling the device and then scanning for hardware changes to reinstall it.
6. Try Another USB Port: If you have another USB port available, try connecting the hard drive there to see if the issue is specific to the port.

If none of these steps work, it may be worth checking for any updates for your Windows operating system or the hard drive's firmware that could address compatibility issues.

References:

• Code 47 - CM_PROB_HELD_FOR_EJECT
• Troubleshoot Disk Management