Record players (or gramophones, as they were sometimes known) used mechanical LPs were played on turntables with a moving arm that bouncedĪlong a groove in the plastic, reading back the music as it went. Both of these ways of storing music were primitive compared Tapes could stretch and distort and sometimes snapped or seized upĮntirely. (long-playing) records and cassette tapes. Until CDs were invented, music was typically stored on vinyl (plastic) LP Read more about this in our main article on MP3 players. Gadgets like this have now largely been superseded by MP3 players such as iPods, which are much smaller and lighter and pack lots more music into the same space by compressing it digitally. Photo: A small portable compact disc player made by Technics. Off the disc and read the information stored on it. It's shiny so that a laser beam can bounce Telling you what's on the CD the shiny side is the important part. The first thing you notice about a CD is that it is Is a protective layer of plastic and lacquer. Sandwiched in the middle there is a thin layer ofĪluminum. Most of a CD is made from a tough, brittle plastic called Plastic about 12cm (just over 4.5 inches) in diameter.
A compact disc is a thin, circular disc of metal and
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