A hybrid motorcycle capable of mounting thereon a hybrid-type drive unit, which does not project in a vehicle width direction and can be mounted even on a motorcycle having a limited vehicle width, includes a power distributing device positioned between a generator and a motor, and a reduction device arranged rearwardly of the power distributing device. The assembly comprises a printhead mounted on a support, the printhead having an ink ejection face. Methods for creating optical disks embedded with security devices are also presented. The inner joint member can include helical grooves extending in a right-hand direction and in a left-hand direction. These methods and apparatus allow a user to access and make use of electronic media input and output devices by reference to andor utilization of standard printed matter, such as magazines, textbooks, or any other printed matter that can be correlated to electronic media.