Wow, good question. The only thing I can think of is to rip the CDs with EAC to WAV files and then to a File Compare in DOS (FC /b file1 file2). If the songs or discs are identical, then they should not have any differences. If you mean you want to measure the integrity of the disc itself, try Nero CD/DVD Speed (available free as a download - Google for it). It'll show you how many C1 and C2 errors are on your disc. See: http://club.cdfreaks.com/showthread.php?t=75573 http://www.feurio.com/English/faq/faq_vocable_c2error.shtml
