Abstract: An edible body marking device that forms a marking pattern on an edible body by scanning a laser spot. The marking pattern includes, as additional information, positional information of one or more index dots that are made by partially deforming or removing one or more dots of the laser spot, or newly adding one or more dots of the laser spot with respect to a basic pattern that is obtained by forming a plurality of the dots of the laser spot.

Abstract: A large-capacity optical recording medium, comprisesa track region having a plurality of tracks arranged along the concentric or spiral grooves, the track region being radially divided into annular zones, and each of the tracks being partitioned into plural sectors such that a number of the sectors per track is constant in each zone but the number of the sectors per track differs between among zones, wherein an address designating a specific track and sector is previously recorded as a plurality of prepits, the track region having a user-track region, in which a user can optically record or readout information, and a pair of control-track regions, radially bracketing said user-track region, the control-track region permitting the user to read out information therefrom but not to record information thereon, and wherein the control-track region located radially inward of the user-track region is provided with medium information tracks in which medium information has been recorded as prepits, and the control-tra