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SACD

SACD is an optical disc format that offers higher fidelity audio reproduction than previous audio disc formats. Development for the SACD was completed in 1999 by Sony and Philips Electronics. There are presently three SACD types which include hybrid, single-layer, and dual-layer. Hybrid discs have both a standard, "Red Book," layer readable by most CD players and an SACD layer of 4.7 GB. The single-layer SACD has a 4.7 GB layer only, and the dual-layer type has two layers, together amounting to 8.5 GB of storage (neither single-layer or dual-layer types are compatible with legacy Compact Disc players). The format supports multi-channel reproduction, and although the number of tracks contained in a given record is not standardized, many discs present Direct Stream Digital 5.1 surround sound.

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