An apparatus, modules, means, and computer readable media for and a method of logging critical events to a critical event log storage area on a disc in a disc drive are disclosed. The gate comprises two opposed faces spaced from the transverse plane of the gate, at least one face being provided with at least two seals that each extend around the face one seal being located within the periphery of the other such that both seals, when the gate is in the closed position, seal against a seat of the valve body to seal against the pressure of fluid acting on the gate in use. The XFS manager translates the sub-routine call as an entry point into the service provider for processing by the service provider, and a request object associated with the request is instantiated. This provides an even and attractive surface while reducing the amount of labor time required to complete the application.