Multitrack servo marks with perpendicular and longitudinal magnetic fields
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United States of America Patent
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Jun 25, 2019
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N/A
app pub date -
Sep 13, 2018
filing date -
Sep 13, 2018
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Abstract
A servo sector on a disk is read via first and second readers that both span two or more user data tracks. The servo sector has a crosstrack width that spans the two or more user data tracks. The first reader provides a first signal based on detecting a total longitudinal field of the servo sector. The second reader provides a second signal based on detecting a total perpendicular field of the servo sector. A position error of the first and second readers is detected using. A value of the first signal can be used to detect a position error, detect a track-to-track phase error, and/or detect a Gray code error of a track ID field of the servo sector.
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