Abstract: The present invention maintains the low frequency run-out at a desired level during self-servo track writing. Included in the present invention is a method that keeps the low frequency track shape errors (the first few harmonics of the spindle rotational frequency) at a desired level during self-servo track writing. To that end, the present invention generates a correction signal. The correction signal is injected into the servo loop and modifies the path of the actuator while writing the next servo track, and thus modifies the shape of the next servo track. One embodiment injects the correction signal in the servo loop prior to the servo controller and combines it with the position error signal. Another embodiment injects the correction signal after the controller, and directly modifies the actuator input signal. The method does not require any extra disc revolutions, and therefore, it does not increase the time required for the self-servo writing process.