“If vinyl and cassettes can come back in a big way, who is to say where the CD market will be in ten years?” writes Lewin Day. Commenting on Sony’s announced termination of writeable optical media production, the Hackaday contributor ponders the obsolescence of the CD-R, DVD-R, and BD-R. Pre-streaming and -cloud, the formats reigned supreme for media and data storage—now they are archaic. Day notes that the optical media story might not be over, citing recent breakthroughs in mega-high storage optical discs.