DriveInfo[] drives_old;
 
        private void Form1_Load(object sender, EventArgs e)
        {
            drives_old = DriveInfo.GetDrives();
        }
 
        private const int WM_DEVICECHANGE = 0x219;
 
        protected override void WndProc(ref Message m)
        {
            if (m.Msg == WM_DEVICECHANGE)
            {
                listBox1.Items.Clear();
                DriveInfo[] dnew = DriveInfo.GetDrives();
                bool found = false;
                foreach (DriveInfo d in dnew)
                {
                    foreach (DriveInfo d2 in drives_old)
                    {
                        if (d.RootDirectory.FullName == _
                          d2.RootDirectory.FullName)
                        {
                            found = true;
                            break;
                        }
                    }
                    if (found == false)
                        listBox1.Items.Add(d.RootDirectory);
                    found = false;
                }
            }
            base.WndProc(ref m);
        }

-----------------------------------
Betriebssystem: Schrott (Vista)
Entwicklungsumgebung: VS 2008