 | This article needs to beupdated. Please help update this article to reflect recent events or newly available information.(October 2019) |
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| Media type | Optical disc |
|---|---|
| Encoding | Same as Blu-ray for data, different disc metadata format |
| Capacity | 300 GB, 500 GB, 1 TB[1] |
| Block size | 2048 bytes |
| Read mechanism | 155-405 nmdiode laser, Numerical Aperture NA=0.85[1] |
| Write mechanism | 405 nmdiode laser |
| Standard | Archival Disc whitepaper v1 |
| Developed by | |
| Dimensions | 120 mm (4.7 in) diameter 1.2 mm thickness[2] |
| Weight | 16 grams (0.56 oz) |
| Usage | Long-term data storage |
| Extended from | Blu-ray Disc |
| Released | 2015 (11 years ago) (2015) |
| Discontinued | 2024 (2 years ago) (2024) |
Archival Disc (AD) is the trademarked name of a discontinuedoptical discstorage medium designed bySony andPanasonic for long-term digital storage. First announced on 10 March 2014 and introduced in the second quarter of 2015, the discs were intended to withstand changes in temperature and humidity, in addition to dust and water, ensuring that the disc would be readable for at least 50 years.[2] The agreement between Sony and Panasonic to jointly develop the next generation optical media standard was first announced on 29 July 2013.[3] The discs were mass-produced by Panasonic in 2016.[4] The product was discontinued as of 2024.[5][6] The two companies have since collaborated on the development of another format,Optical Disc Archive.
At first, 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 oneterabyte of data, based on the roadmap plans of both companies.[1][2][7][8]
The Archival Disc standard jointly developed by Sony and Panasonic used signal processing technologies such as narrow track pitchcrosstalk cancellation, highlinear densityinter-symbol interference cancellation andmulti-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 ofReed–Solomon Code error correction.
In 2019, Sony and Panasonic released a third-generation Optical Disc Archival.[9] In 2020, Sony began shipping their Gen3 PetaSite Optical Disc Archive, which could store up to 2.9 PB of data.[10][11]
In the summer of 2015,Sony was scheduled to release a roadmap plan[12] to increase Archival Disc capacity from 300GB to 1TB per disc. A release timeline for larger-capacity discs was not released as of 2022.[needs update]
Sony expected the new standard to see usage in the film industry (such as storage of4K resolution audiovisual data[13]), archival services, andcloud data centres handlingbig data.[1] The disc format was not intended as a consumer storage medium as of 2014, but rather for professional-level data archives.[2] In order to reach a larger capacity whilst ensuring higher playback signal quality, the standard will employ crosstalk cancellation andpartial-response maximum-likelihood (PRML) signal processing.[1] Both companies marketed the optical format under their respective brands.
Sony used Archival Disc in theirOptical Disc Archive professional archival product range, and aimed to create at least a 6-TB storage medium. As of 2020, they offered 5.5 TB Optical Disc Archive Cartridges.[14][15][16]
In 2016, a use case for Archival Disc was projected forcold data storage within the datacenter.[17]
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