A data packer of an inputoutput hub of a computer system packs and formats write data that is supplied to it before the write data is written into a memory unit of the computer system. The disc is designed to withstand the fluid pressure head in the string and a leak test pressure, and to then burst and fully open under a predetermined overpressure. Left and right cushioning members are respectively mounted on left and right sides of the footrest panel. Each groove extends at least partially along an outer surface of the substrate and narrows at an opening thereof, such that each groove is re-entrant shaped. Said food composition of bioavailable methionine comprises: a) a bioavailable methionine compound and b) at least one essential oil. A dispersed address includes synchronization marks, positive marks, and negative marks.