An alternating DC track servo pattern for perpendicular recording

We describe an alternating dc track servo pattern as a way to avoid magnetization imbalances within the position error signal (PES) regions of the media in perpendicular recording systems. A spin-stand was used to compare signal amplitude and medium noise between the alternating dc track servo pattern and a conventional dc-track servo pattern. The alternating dc track servo pattern improves the signal amplitude and decreases the residual noise. Therefore, the new servo pattern exhibits a superior signal-to-noise ratio of the PES regions.