Converting CD's to ISO's
I'm backing up all of my CD media (games, programs, etc) and am storing them on a 4TB external hard drive array as ISO's.
In converting the discs, I'm finding that performance varies pretty wildly on speed vs stability. If its fast, it'll create a readable ISO 50% of the time. If it's 100% readable it takes hours to complete. Not to mention lack adjustability on parameters. (ie Nero - garbage)
What software should I be looking to accomplish this? Recommendations?