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have a diameter of 120 mm and typically hold up to 74 minutes of audio or approximately of data. This was later regularly extended to 80 minutes or by reducing the spacing between data tracks, with some discs unofficially reaching up to 99 minutes or which falls outside established specifications. Smaller variants, such as the Mini CD, range from 60 to 80 mm in diameter and have been used for CD singles or distributing device drivers

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