How to interrogate optical discs

I think I need help from anyone having special exertise with growisofs/mkisofs, I'm trying to troubleshoot a discrepancy between the number of 2k sectors detected by discspan.py (see http://sourceforge.net/projects/discspan/) and the capacity specs reported on Wikipedia (http://en.wikipedia.org/wiki/DVD%2BR#Recordable_DVD_capacity_comparison).

Is there a simple command line I can use to interrogate a blank optical disc that will return the number of sectors/blocks on it?

--Doc Savage
  Fairview Heights, IL

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