on the disc surface when the data is written to the disc surface in a known manner once the data is recovered it is provided to error detection circuit 130 which detects whether any errors have occurred in the data read back from the disc correctable errors are corrected by error detection circuit 130 or drive controller 120 or a combination of both in a known manner during head positioning drive controller 120 provides a position signal to servo control processor 122 causing actuator assembly 18 to position the head gimbal assemblies over a selected cylinder in a sector servo positioning drive a portion of each sector has position information which is read by the data head and provided through the read channel to servo control processor 122 the positioning information gives tuning feedback to the servo control processor for better positioning the present system could also be used in a dedicated servo system in which one of the surfaces 140a or 140b of a disc 139 is dedicated to servo information in either type of system servo control processor 122 reacts to the position information read from disc pack 12 and positions the head gimbal assemblies accordingly using a rotary actuator introduces a skew angle between data tracks and the axis of a dual gap head the skew changes as the data head moves from the inner diameter of the disc to the outer diameter of the disc therefore performance of a dual gap magnetic head can be optimized for a particular track on a magnetic disc by aligning the write gap with the data track when writing information and aligning the read gap with the data track when reading information in the preferred embodiment the offset between the read and write transducers for.