Bi-directional servo track writing to minimize sidewall writing at high skew angles

摘要

Head skew can cause magnetic transition overlap while writing at least two passes for a data track. That overlap can cause interference, which may affect the position error signal and other portions of the servo sector, such as sector address mark and digital data, of the servo system of the disc drive. The present invention overcomes this problem by utilizing a bi-directional servo writing method. One method of the present invention writes the servo information to the MD from either direction. More particularly, this method writes servo information from the OD to the MD and from the ID to the MD. In this manner, the present invention at least reduces the effects of head skew while writing servo information.