Investigation of the slider corner/disk impact process at the Head Disk Interface was carried out using a dynamic elastic-plastic finite element model of a sphere obliquely impacting a thin-film disk. The effect of slider corner radius and impact velocity on critical contact parameters was examined. To characterize the energy losses due to the operational shock impact damage, the coefficient of restitution for oblique elastic-plastic impact was studied using the finite element model. A method to use a physics-based elastic-plastic oblique impact model in conjunction with an analytical normal impact model was proposed to accurately predict coefficient of restitution for a rigid sphere impacting a half-space. This analytical model results compared favorably to the FEA results for the whole range covering low impact angles (primarily normal impacts) to high impact angles (primarily tangential impacts).