A method and apparatus for writing magnetization states in magnetic islands of a multi-level patterned magnetic recording medium with more than two recording levels and a method and apparatus for reading readback waveforms representing written magnetization states of the magnetic islands in the multi-level patterned magnetic recording medium. The digital baseband processor includes a digital signal processor for executing digital signal processor instructions, a microcontroller for executing microcontroller instructions, and other modules which may require one of the plurality of clock signals for operation. The header may instruct the one or more relays to which of the nodes to send the flood packet. Therefore, it forms an overload protection. If the presence of the data in the printing buffer is detected after the line is disconnected, the data is printed.