In a magnetic recording disk file, pitch moment exerted by the flexure on the slider is usually treated as a product of flexure pitch-static-attitude (PSA) and pitch-stiffness (Kp), both measured in the absence of preload (gram-load). However in the presence of preload, pitch moment due to dimple friction must be considered. We shall show by elementary beam theory that lever-arm of the dimple friction is related to the flexure bow-height, and that to minimize uncertainty in the pitch moment, hence improving the fly height distribution, the flexure must bow toward the disk. These results will be confirmed experimentally.

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