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Post  admin on Tue 27 Jul 2010, 7:54 am

The surface of a DVD drive is a series of pits and lands. Every time it changes from a pit to a land, it represents a binary bit of ‘1’. Every time it stays flat, it represents a ‘0’. Because it is impossible to have two changes between a pit and a land without some kind of flat in between, there are three spaces worth of flats between every real piece of data.


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