A nasal spray formulation for use in female contraception or in the treatment of benign gynecological disorders is described. In particular, the battery holding portion may include a battery having an anode andor a cathode formed in a shape corresponding to a shape of an outer surface of the battery holding portion and a connector connecting the battery to the circuitry of the mobile unit. In particular, by the method of managing data using information stored in a defect management area, generation of errors is prevented in reading or writing due to the change of a physical position of a real-recorded file which are caused by wrong calculation of the start logical sector numbers for each zone. A file description of the corresponding shared file is obtained from a cloud server according to the URL. By combining a progressive sampling technique with data perturbation methods, the recommendation system is both scalable and privacy-preserving.