A magnetic bearing device includes a magnet generating a magnetic field at a protrusion formed toward a roll shaft, and a body portion supporting the magnet in one direction. SolutionThe low-friction ZnO coating, comprising and planes, and further comprising, ,, and planes in lower proportions than those of the and planes, has been prepared by sputtering using a zinc target in a sputter gas environment, wherein the sputter gas comprises an inert gas and oxygen gas, and the oxygen gas ratio is controlled. The correspondence relation memory stores correspondence relation between the data types and software applications used in input of data. If not, the system stores the request in the data processing system andor sends data corresponding to the new request to at least one of the secondary data processing servers to enable confrontation with an offerdemand responding to the new request received subsequently by the secondary data processing server. The database is adapted to form an association between the received copy of the passenger name record and the input data received from the passenger, and store the copy of the passenger name record. Additionally, various methods, apparatus, systems, and data structures may operate to generate or store error correction data for the modified sector and combining the plurality of sectors, the error correction data for each of the plurality of sectors other than the particular page, and the block management data and the error correction data for the modified sector.