Development of the pushpin free STW

In order to realize super-high density TPI, it is necessary to greatly reduce track misregistration. For this purpose, it is necessary to reduce the amount of repeatable position errors (RPE) and improve the writing accuracy of position error signals (PES) of servo track writers (STW), in parallel with reducing non-repeatable position errors (NRPE) with fluid dynamic bearings or piggyback actuators employed. This paper introduces a new, low-priced STW system of high efficiency, with a high precision writing performance.