Seagate Technology Incorporated

Li Li

Ling Wang

Zine-Eddine Boutaghou

Mark James Schaenzer

Subrahmanyan Nagarajan

Zuxuan Lin

An optical certifying head flies above a disc surface within an evanescent decay length of the disc surface. A light beam is focused through an objective lens, and further focused through a SIL. The SIL-focused light is coupled to the disc surface through near-field coupling. The light is reflected from the disc surface depending on a surface condition of the disc such that the surface condition can be determined.

Near field optical certifying head for disc asperity mapping

An air bearing slider has an air bearing surface with two rails separated by a cavity. The rails are nonsymmetrical about the longitudinal axis. Instead, the width of the active rail is greater at the trailing end than at the leading end, such as by having a hook portion,which extends inward at a sharp angle to the longitudinal axis of the slider. The wider hook portion,causes an increased flying height sensitivity to underlying disc/wind speed. The nonactive rail has a greater width than the non-hook portion of the active rail, so the slider exhibits slight negative roll. A vibration sensor is attached to the air bearing slider, and the air bearing slider is used in glide testing of discs.

Air bearing slider with increased speed sensitivity

A system for burnishing a disc includes a slider having burnish pads. The burnish pads are disposed on air bearing surface of the slider and extends therefrom. The burnish pad includes a burnish face which configured to burnish a surface of the disc and blow away burnished asperities.

Slider for burnishing a disc

An apparatus for detecting surface variations on a rotating disc includes a slider, suspension assembly, first surface variation sensor, second surface variation sensor, and a controller. The slider is adapted to fly over the disc. The suspension assembly is coupled to the slider to position the slider over the disc. The first surface variation sensor is disposed on the slider, and provides a first sensor signal based upon slider contact with one of the surface variations. The second surface variation sensor is disposed on the slider and spaced from the first surface variation sensor. The second surface variation sensor provides a second sensor signal based upon slider contact with the surface variation. The controller receives the first and second signals and calculates a position of the surface variation based upon the first and second sensor signals.

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Bloomington, MN, United States of America

Li Li