'Update the stored device information with the driveinfo if the
device indicates that getting driveinfo is slow'

def slow_driveinfo(self):

    info = self._device_information['info']
    if ((not info[4]) and self.device.SLOW_DRIVEINFO):
        info = list(info)
        info[4] = self.device.get_driveinfo()
        self._device_information['info'] = tuple(info)
