private void ScanDisk()
        {
            DriveInfo[] drives = DriveInfo.GetDrives();
            foreach (var drive in drives)
            {
                // 可移動存儲設備，且不是A盤
                if ((drive.DriveType == DriveType.Removable) && false == drive.Name.Substring(0, 1).Equals("A"))
                {
                    Console.WriteLine("找到一個U盤：" + drive.Name);
                }
            }
        }

const int WM_DeviceChange = 0x219;   // 系統硬件改變發出的系統消息
        const int DBT_DeviceArrival = 0x8000;   // 設備檢測結束，并可以使用
        const int DBT_DeviceRemoveComplete = 0x8004;// 設備移除

        protected override void WndProc(ref Message m)
        {
            base.WndProc(ref m);

            if (m.Msg == WM_DeviceChange) // 系統硬件改變發出的系統消息
            {
                switch (m.WParam.ToInt32())
                {
                    case WM_DeviceChange:
                        break;
                    case DBT_DeviceArrival:
                        ScanDisk(); // 掃描所有滿足特征的設備
                        break;
                    case DBT_DeviceRemoveComplete:
                        ScanDisk();
                        break;
                    default:
                        break;
                }
            }
        }