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Super Audio CD

Media format
Super Audio CD is an optical disc format for audio storage introduced in 1999. It was developed jointly by Sony and Philips Electronics and intended to be the successor to the compact disc format. The SACD format allows multiple audio channels. Wikipedia
Sampling rate: 2822.4 kHz
Capacity: 4.38 GiB / 4.7 GB (Single Layer and Hybrid); 7.92 GiB / 8.5 GB (Dual Layer)
Developed by: Sony & Philips
Encoding: Digital (DSD)
Extended from: Compact Disc Digital Audio
Read mechanism: 650 nm laser (780 nm for the CD layer of a Hybrid disc)
Released: 1999; 25 years ago