A slider is provided with projections. In the ink tank, an information storage element and a module are provided on a ceiling portion of an ink accommodating chamber directly accommodating ink; the module having an optical reflector that faces downward in a vertical direction. The system further includes a pulse transformer, coupled to the PHY chip, capable of relaying the signal pulse provided by the PHY chip to the PD via the transmit line and a second PHY chip. The swath edge detector includes a calibrator that monitors uncut grass for calibration of the swath edge detector.