Microsoft Windows: Unable to unmount an ISO image, An error occurred while ejecting - Microsoft Community

Unable to unmount an ISO image, An error occurred while ejecting - Microsoft Community

Increasingly software is distributed as large files that are images of CDs or DVDs rather than the physical objects. They can be mounted as Windows drives, but then they can't be unmounted with the Eject command that works with a real CD/DVD drive or a thumbdrive.

What's funny/infuriating is how the Microsoft employees' answers all follow the same script that someone with no knowledge of Windows internals would try, steps that require hours or days and may be destructive -- reboot in safe mode, do a system restore -- while some random user comes up with the actual answer that solves the problem in seconds.

(The answer is to use PowerShell, and probably need to run it as Administrator: mountvol DRIVELETTER: /d )