Skjerven, Morrill, MacPherson, Franklin, and Friel
Information detecting system
 An integrated servo system for a disk drive employing sector servo positioning information on concentric tracks of a recording medium utilizes a servo burst pattern with three sequentially occurring servo bursts. One burst is positioned to have a maximum amplitude plateau on a track centerline of alternate tracks, and the other two bursts have maximum plateau values at locations between the centerlines of adjacent tracks. The amplitudes of the bursts are sequentially detected by a peak detector and supplied to sample and hold circuitry for measuring their relative amplitudes. Discriminator circuitry utilizes a window to provide two samples of each transition in the servo pattern and compares the samples to detect different fields and events in the pattern. 
Western Digital (Singapore) PTE
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G11B G11B H04L G11B H04L H04L G11B H04L H04L
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Richard W. Robert P. Marshall D. Min-Hui David B. Takashi Michael R.
Hull Mento Lee Wang Joan Asami Spaur