How to do a Scan

I have Nero cd/dvd Speed & dvdinfopro & have done read scan on discs I have burned with the Plextor Px-708A, & the scans show zero errors, using the Plextor px-708a as well for the test. How could this be, when others are having ton of errors, am I suppose to use a DVD-Rom drive for the test??? or is the px-708a ok for this.