How do you programmatically eject an USB mass storage device?

Question

How do you programmatically eject(safely remove) an USB mass storage device in Windows (XP)?

Answer 1

First download de code from http://www.codeproject.com/Articles/13530/Eject-USB-disks-using-C

Then import the classes of the folder "Library" to your project

And put this code into your click button.

private void btnExpulsar_Click(object sender, RoutedEventArgs e)
        {
            //Expulsa todas las unidades
            VolumeDeviceClass volumeDeviceClass = new VolumeDeviceClass();  //Enlista las unidades
            foreach (var item in volumeDeviceClass.Devices.ToList())
            {
                if (item.IsUsb)//Verifica que sean unidades USB
                {
                    item.Eject(true); //Expulsa las unidades
                }
            }
        }   

Answer 2

In autoit, you have a script which does just that.

It basically comes from this Microsoft article and uses kernel32.dll DeviceIoControl function

Of course, this question appears to be a duplicate of Safe remove USB-Drive using Win32 API?, which gives other solutions

Answer 3

You could spawn a process and use a command line tool. This would also work from other languages such as java where calling the Win32 api is harder.