We Can Figure This Out.org
Virtual Lab: The Inner Workings of CD/DVD Drives
 University of Virginia
             
 
© 2003-Present, John C. Bean
 
To figure this out, we need to study what happens when the disk tries to move above or below the point where the laser focuses.

We start by simplify things a bit, and looking at just a small reflective part of the disk.
 
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