A method and apparatus for disc drive modeling to determine head-to-media spacing subject to disc media topography, roughness and waviness, is disclosed. An transmission unit transmits the SR at the timing determined by the determination unit. For this purpose, a stencil having inherent stiffness is arranged above the carrier plate and the paste-like material is pushed through at least one recess in the stencil. The microphone of the mobile device may be muted in response to the proximity data that indicates the mobile device is not proximate to the ear of the user.