An iterative TMR mitigation method based on readback signals for bit-patterned media recording

Off track condition or track mis-registration (TMR) is the most significant problem in the extremely high-density bit-patterned media recording (BPMR) system since a track pitch or spacing between the adjacent tracks becomes narrower [1]. Although the servo system is used to handle the TMR [2-3], it requires some special data to be inserted in the tracks so as to estimate the amount of head offset. However, it is normally difficult to approximate the behavior of the read head when the TMR occurred beyond the limit [3]. Therefore, this paper proposes an iterative TMR mitigation method for BPMR systems based on the readback signals.