what is data track spacing on CDs and DVDs?

Question

what is data track spacing on CDs and DVDs? whats the importance of measuring it?please help me..x_X

Answer 1

On a CD, the space between tracks is about 1.6 microns, versus spacing on a DVD-R which is about 0.74-0.8 microns. This track spacing is important because this is why we have CDs and DVDs that are physically the same size, but have different storage capacities.

CDs and DVDs store data much like vinyl records did - in a spiral. The length of the spiral is directly related to the spacing between the tracks - since the tracks are tighter in DVDs, the overall spiral length is longer, which means you can have more data on that disk. (There are other factors that make CDs and DVDs different in terms of storage capacity - don't think that this is the only defining characteristic differentiating the two.)

Answer 2

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