Compact Disc
From the Simple English Wikipedia, the free encyclopedia that anyone can change
A Compact Disc or "CD" is a flat round disc used to store data. The CD was invented in the late 1960s by James T. Russell. They are used to store music and other sounds (and sometimes called an "audio CD").
Later, Compact Discs were made that could be used to put computer files on in the same way as audio compact discs. These are called CD-ROMs (Compact Disc Read Only Memory). The computer 'reads' the disc using a CD-ROM drive. Another use is to store MPEG video's cheaply, these CD's are called VCD's (Video CD's) and are especially popular in Asia. For example in Indonesia they are used instead of the much more expensive DVD.
The length of a normal CD is 120 mm. The middle hole in a CD has is about the size of a five pence coin (About 1.5 cm). The person who decided the size was Dutch and used the size of an old Dutch coin, (old because the Dutch now have switched to the Euro) called a "dubbeltje", or dime.
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