const int IOCTL_STORAGE_GET_DEVICE_NUMBER = 0x2D1080;
Const IOCTL_STORAGE_GET_DEVICE_NUMBER As Integer = &H2D1080
public const int IOCTL_STORAGE_GET_DEVICE_NUMBER = 0x2D1080;
if (DeviceIoControl(h, IOCTL_STORAGE_GET_DEVICE_NUMBER, IntPtr.Zero, 0, ptrSdn, nBytes, out requiredSize, IntPtr.Zero))