A three-way trust relationship is established between a mobile device, Internet-connected vehicle system, and a cloud-based service. The scaffolds are made from a random copolymer of PLLA and a rubbery polymer such as polycaprolactone. A TFT, including a gate electrode, a source electrode, a drain electrode, a channel layer, and a gate insulating layer, is formed on the TFT region of the substrate. Every time sets of servo data, each consisting of various types of data items, are written in the disk, the head is moved by a predetermined pitch in a radial direction of the disk. According to the invention, the holder is designed as a part of a circuit board for connecting the phase windings.