Super-resolution (SR) effects of a thermo-chromic organic dye mask layer are investigated for a rewritable disk with a Ag–In–Sb–Te phase-change recording layer. Clear SR effects were recognized in both linear and radial directions in the rewritable disk, corresponding to a capacity of 10.3 GB in a 120 mm disk. A carrier-to-noise ratio over 35 dB was obtained at a short mark length of 0.2 µm. Crescent-shaped marks, which are typically recognized in high-density magneto-optical (MO) media, were observed in the phase-change recording layer. The SR effects mainly operate on the reading process, resulting from a large non-linear transmittance change in the organic dye.