A method of reading data in a multi-reader two-dimensional magnetic recording system includes determining a position of a multi-reader head, selecting a mode for reading the data of a magnetic recording medium as a function of the position of the multi-reader head, and reading the data of the magnetic recording medium in the selected mode. A client media player is employed to determine whether media content is protected. The communication distance is compared to a predetermined distance and the communication apparatus dynamically adjusts its resonance frequency for improved magnetic-field communication with the external apparatus. Receivers are described that initialize the parameters of the adaptive filtering using discrete Fourier transform calculations on the training signal, and receivers are described that initialize the parameters of the adaptive filtering using the results of match filtering for the particular pseudo-random noise sequence. All classes that are implementation artifacts are eliminated from the design data. The manner with which the synchronization is executed may then be based on the threshold value amount.