Question: what are the dimensions of a music cd?
Answer: Standard CDs are available in two sizes. By far, the most common is 120 millimetres (4.7 in) in diameter, with a 74- or 80-minute audio capacity and a 650 or 700 MiB (737,280,000-byte) data capacity. Discs are 1.2 mm thick, with a 15 mm center hole.