US Patent 7803444 Optical disk and method or producing optical disk

An optical disk is disclosed. The optical disk includes a substrate having lands and pits arranged and formed along a recording track so that data are recorded; a reflective film deposited on the substrate; and a protective layer formed on the reflective film, where an edge of the pits in the array direction is irradiated with light from a side of the protective layer to deform the pits, so that pit data are rewritten and recorded, and the reflective film includes an alloy formed of AlFeX having Al as a main component, where X contains any one or more of Ti, Cu, Au, Pt, and Si.