Abstract: A method for writing servo information onto a disk of a hard disk drive with a servo writer. The method includes writing a plurality of spiral servo signals with a head. The spiral servo signals are used to write servo patterns using at least one timing window. The timing window is adjusted using a position error signal generated from the spiral servo signals. The adjusted timing window is then used to write servo patterns onto the disk. Adjusting the timing window compensates for irregularities in the spiral servo signals.

Abstract: a method for writing servo information onto a disk of a hard disk drive with a servo writer. The method includes writing a reference servo pattern onto a track of a disk. A head is then positioned relative to the reference servo pattern and a spiral servo track is written onto the disk. The process of positioning the head relative to the reference servo pattern and writing a spiral servo track can be repeated to create a plurality of spiral servo tracks on the disk. The spiral tracks are used to write radial servo patterns that are utilized during normal operation of the drive. The reference servo pattern allows each spiral track to start at a point with the same radial distance from the center of the disk. This improves the accuracy of the spiral tracks and the resultant final servo patterns.