Glossaryrecord
A record or record album was the most common medium for the sale and distribution of music for much of the 20th century until they were replaced by compact discs (CD) in the 1980s. They were generally referred to by their revolutions per minute (RPM), i.e. 45, 33 1/3, and 78.
A 12-inch (30 cm) 331⁄3 rpm record (left), a 7-inch 45 rpm record (right), and a 5-inch (120 mm) Compact Disc (above).
Comparison of various size records and a CD.http://upload.wikimedia.org/wikipedia/en/thumb/c/c8/Vynil_record.jpg/325px-Vynil_record.jpg