A controller for a disk drive measures track misregistration, extracts non-repeatable runout from measured track misregistration, determines one or more components of non-repeatable runout at various radial locations of a disk, and compares the determined components to known values at different altitudes to determine an operating altitude of a disk drive.

 
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> Center split feature and pressurization for altitude insensitivity, high pitch torque and high preload sensitivity air bearing slider

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