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In page Super Audio CD:

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SACD discs have identical physical dimensions as standard compact discs. The areal density of the disc is the same as a DVD. There are three types of disc:[2]

  • Single-layer: A disc with one 4.7 GB SACD layer.
  • Dual-layer: A disc with two SACD layers, totaling 8.5 GB, and no CD layer. Dual-layer SACDs can store nearly twice as much data as a single-layer SACD. Like most dual-layer DVDs, the data spiral for the first layer is encoded from the inside out, and the second layer is encoded starting from the point where the first layer ends and ending at the innermost part of the disc.[citation needed] Unlike hybrid discs, both single- and dual-layer SACDs are incompatible with conventional CD players and cannot be played on them.