Archival Disc

Originally, the discs were designed to hold 300 gigabytes of data, then a second version of the discs could hold up to 500 gigabytes, and eventually a third version of the discs could store up to one terabyte of data, based on the roadmap plans of both companies. The Archival Disc standard jointly developed by Sony and Panasonic used signal processing technologies such as narrow track pitch crosstalk cancellation, high linear density inter-symbol interference cancellation and multi-level recording. The disc structure features dual sides, with three layers on each side, and a land and groove format. The track pitch is 0.225 μm, the data bit length is 79.5 nm, and the standard will utilise the method of Reed–Solomon Code error correction. In 2019, Sony and Panasonic released a third-generation Optical Disc Archival. In 2020, Sony began shipping their Gen3 PetaSite Optical Disc Archive, which could store up to 2.9 PB of data. == Use ==

Sony expected the new standard to see usage in the film industry (such as storage of 4K resolution audiovisual data), archival services, and cloud data centres handling big data. In 2016, a use case for Archival Disc was projected for cold data storage within the data center. == See also ==