In an apparatus for reproducing recorded data, a crosstalk signal is generated by converting adjacent data recorded on an adjacent track into a waveform of said reproduction signal and the crostalk signal is deducted from the reproduction signal. A second strength portion is separable from the first fiber containing portion arranged in a substantially flat arrangement. The capacitive load may comprise a piezoelectric element, which may comprise an inkjet printer head inkjet actuator. Based on memorised maps of the imager blemish defects, and continually monitored variations of the imager output signal, the control unit will reject false triggering due to imager defects or variations of the ambient and temperature conditions.