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URL:  http://boards.fool.com/there-is-a-micro-bar-code-on-the-hub-of-each-disc-30111298.aspx

Subject:  Re: Multiple disk DVD players Date:  6/22/2012  4:30 PM
Author:  mschmit Number:  829 of 886

There is a micro bar code on the hub of each disc. Each title could have all the same codes for all discs mass produced...or they could be unique, based on the spec for this. But even without this code the software could read the directory on the disc and do a checksum or something to get a unique ID for each disc.

Mike
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