Method for manufacturing a disk drive having an overwriteable clock track

Abstract

A method of manufacturing a disk drive having a rotary actuator and a disk. The rotary actuator includes a disk transducer head for reading and writing on the disk. The method includes the steps of placing the disk drive in a servo track writer. The servo track writer includes a clock head and means for moving the rotary actuator. The clock head includes an inner transducer and an outer transducer, the inner transducer and the outer transducer being radially spaced apart. A pair of continuous phase coherent radially spaced apart clock tracks are written with the clock head, the clock tracks comprising an outer clock track and an inner clock track wherein the inner clock track is disposed closer to an inner diameter of the disk than the outer clock track. A reference timing clock is read from either or both of the inner and outer clock tracks with the clock head. A portion of a servo track is written during a rotation of the disk with the disk transducer head, synchronized to the reference timing clock, the servo track portion including a series of equally spaced apart servo sector portions. The disk transducer head is incrementally moved in an arcuate path towards the inner diameter of the disk. The steps of reading the reference timing clock, writing a portion of the servo track, and incrementally moving the disk transducer head are repeated to write a complete set of servo tracks on the disk, wherein the servo sector portions form interruptions in the inner and outer clock tracks, and adjacent inner and outer clock track interruptions are circumferentially displaced from one another so as to enable a continuous stream of clock pulses to be read by the clock head.

Dependencies are inferred from the claim text.