public static extern UInt32 GetVirtualDiskInformation( VirtualDiskSafeHandle VirtualDiskHandle, ref UInt32 VirtualDiskInfoSize, ref GET_VIRTUAL_DISK_INFO VirtualDiskInfo, IntPtr SizeUsed);// to make it optional (pass IntPtr.Zero)
public static extern Int32 GetVirtualDiskInformation(VirtualDiskSafeHandle VirtualDiskHandle, ref Int32 VirtualDiskInfoSize, ref GET_VIRTUAL_DISK_INFO VirtualDiskInfo, ref Int32 SizeUsed);
public static extern UInt32 GetVirtualDiskInformation( VirtualDiskSafeHandle VirtualDiskHandle, ref UInt32 VirtualDiskInfoSize, ref GET_VIRTUAL_DISK_INFO VirtualDiskInfo, ref UInt32 SizeUsed);