When you rip a CD the effectiveness of the rip is a function of how well the CD laser reads the disc, just like it is in real life when you play the CD. so, that's why following whatever regimen one uses for playing CDs when ripping them is a very good idea. Things like EOM, demagnetizing the disc, coloring the disc, ionizing the disc, beveling the disc, etc. All of these things will improve the rip.