An information storage medium according to an embodiment of this invention includes a wobbled groove having a wobble period modulated by multi-frequency shift keying corresponding to playback control information. A plurality of contact terminals received in the passages and each including a mounting portion securely positioned within the corresponding passage, each contact terminals including a contacting point extending from the mounting portion and out of the first mating surface, and a terminating end portion extending also from the mounting portion and away from the passage. The flanged member has a notch in its vertical flange which contacts the floorboard to be abutted, requiring a minimal amount of space between the obstruction and floorboard to be set. Metadata properties provide a mechanism to describe the metadata itself, and metadata security can be used to ensure authentic metadata is sent and received.