In a granular magnetic recording layer of a perpendicular magnetic recording medium, media noises are reduced by separating adequately magnetic crystal grains and non-magnetic grain boundary and decreasing magnetic exchange interactions among the magnetic crystal grains without causing damage to magnetic anisotropy of the magnetic crystal grains. The housing is pivotally connected to the support via a pivot shaft and is pivotable between an operational position in which the radiation emission plane is horizontal, and a rest position in which the radiation emission plane vertical with a single rotation of the pivot shaft about a pivot axis extending through the pivot shaft. The truck contact includes a first group of guides that cooperate with a second group of guides on a truck charging contact and a third group of guides on a truck operation clamp. The gateway further comprises an interface for making the extracted data andor formatted data available as packet data network data at a PDN output port of the gateway.