Secure ripping
What is Secure Ripping?
Making sure there were no errors during the extraction of your cd audio. Rippers such as CDex and EAC try to ensure a bit-perfect rip for every track by checking the results, and re-reading any bad areas (from scratches) as many times as needed.
A bit-perfect rip may not always be possible, and so these programs (EAC especially) will report on any errors that could not be corrected, allowing you to examine or attempt to correct the problems.