a, Dual-beam configuration for super-resolution writing and reading. b, Spin-coating process for material addition, material diffusion and blank-disk molding. c, The capacity of a single 3D nanoscale disk is approximately equivalent to that of a petabit-level Blu-ray library or an HDD data array. Credit: Nature (2024). DOI: 10.1038/s41586-023-06980-y ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ A team of photonic engineers affiliated with several institutions in China has developed a new type of optical DVD that is capable of holding up to a petabyte of data. The group used a new material to coat the DVDs and new laser techniques to write data. The results are published...