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A two‐photon 3D optical storage system based on a photochromic diarylethene (1, 2‐bis (2‐methylbenzo [b] thiophen‐3‐yl) hexafluorocyclopentene) and a highly efficient two‐photon absorbing fluorescent dye (2, 7‐bis [4‐(9, 9‐didecylfluoren‐2‐yl) vinyl] phenylbenzothiazole) is demonstrated. The figure shows two‐photon fluorescent readout of data recorded by single‐photon excitation. The system is suitable for recording data in thick storage media and providing a non‐destructive readout method.