yea, verification is just that, it verifies that all data was written without error. I've written data before and had the verifcation fail on me, usually because I was writing onto a crappy disk at a high speed. In general you're going to want to let the verification happen, because if it comes back with an error and you were backing up something important, that's your cue to chuck the cd/dvd that you just burnt and make another one, and make sure it passes verification. Otherwise certain items could be unreadable/corrupt etc.