Embedded servo track following system and method for writing servo tracks.

摘要

The system includes positioning means energizable for moving the read/write head to preselected recording positions relative to the disc and drive means for creating relative movement between the disc and the read/write head thereby enabling the transfer of data between the storage medium and the head. A plurality of servo tracks are embedded or recorded in servo data sectors on the disc for identifying preselected radial positions or informational data tracks on the disc. The servo data tracks are provided with a nonuniform radial track density. The track density of the servo tracks varies from more dense at the periphery of the disc to less dense at the interior of the disc. The radial track density of the servo data tracks is established with a method of writing embedded servo data that allows the unique performance characteristics of the moving read/write head to determine the actual spacing of the tracks. A clock track is written by writing a single pulse on a fixed clock track head, phase-lock looping to an intermediate clock track, which is written on a moving read/write head, and then phase-lock looping up to the final clock track which is written on the fixed clock track head. Radial track density is then determined by moving one of the read/write heads to a limit stop and writing a reference track.