def __init__(self):
        vstruct.VStruct.__init__(self)
        self.Type = v_uint16()
        self.Size = v_uint16()
        self.Flags = v_uint16()
        self.VolumeLabelLength = v_uint16()
        self.DeviceObject = v_ptr32()
        self.RealDevice = v_ptr32()
        self.SerialNumber = v_uint32()
        self.ReferenceCount = v_uint32()
        self.VolumeLabel = vstruct.VArray([ v_uint16() for i in xrange(32) ])