Importance

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Abstract

A pattern, useful in providing data to a processing scheme to control the fine positioning of a transducer head of a disk drive unit, comprises an erased gap followed by an automative gain control (AGC) information burst followed by a first burst of servo control information followed by a second burst of servo control information. The pattern is written on a disk by the disk drive unit using a mechanical index on an armature associated with the rotation of the disk as a primary time reference, with all other time references being based on a transition between the erased gap and the AGC burst. The first and second servo control information bursts are written alternately off track by one half of the track separation between the track of interest and the next adjacent tracks to each side thereof. Decoding the pattern using a comparator circuit, comparing the servo control information waveform with the output ramp from an integrator circuit, digital positioned control data results to adjust the transducer to be centered on the track of interest.

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First Claim