Re: What is the formula for finding the track length of a CD?

Date: Sun Jul 15 17:33:39 2001
Posted By: Steve Taylor, Professional Engineer
Area of science: Physics
ID: 994728949.Ph

Message:


Not quite sure I see the relevance to diffraction studies...

Anyway,  A good way to measure the track length is to measure the width of
the CD surface (r_outer - r_inner) and divide by the track spacing (1600
nm) to determine the total number of tracks. Now multiply this by the
average radius 1/2 * (r_outer + r_inner). 

A DVD works as an 1800 lines /mm grating.

Steve

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