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Archival Disc
Archival Disc (AD) is the name of a trademark owned by Sony Corporation and Panasonic Corporation describing an optical disc storage medium designed for long-term digital storage. First announced on 10 March 2014 and planned to be introduced in the second quarter of 2015, the discs are intended to be able to withstand changes in temperature and humidity, in addition to dust and water, ensuring that the disc is readable for at least 50 years.〔 The agreement between Sony and Panasonic to jointly develop the upcoming generation optical media standard was first announced on 29 July 2013.
== Specifications ==
The discs are designed to hold 300 gigabytes of data in their first release, then a second version of the discs will hold up to 500 gigabytes, and eventually a third version of the discs will be able to 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 will utilise signal processing technologies such as narrow track pitch crosstalk cancellation, high linear density inter-symbol interference cancellation and multi-level recording. The disc structure will feature 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 detection.
抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』
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