Abstract
A dynamic track-following technique has been developed that enables real-time reading of on-track data from off-centered hard disks on a spin stand. The technique makes use of piezoelectric transducers (PZT’s) to dynamically control the radial displacement of the read head to follow off-centered tracks. Controlling algorithms based on the Preisach model of hysteresis have been devised to compensate for the hysteretic effects of the PZT. Techniques for extracting the trajectories of off-centered hard disk tracks and special methods of selecting the initial phase of these tracks and locking the phase thereafter have also been developed. The track-following technique has been demonstrated to dynamically follow off-centered commercial hard disks with a track density of 90kilotrackperinch mounted on a spin stand.
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