CD Audio

Right, the numbers by the disc symbol simply correspond to the number of AR submissions for that particular disc and very similar pressings. Sometimes, even for a very popular album, you might have an "odd duck" pressing where there are not that many submissions. Sometimes, you get an album that no one else has submitted. In that case you will not get the little disc symbol but rather a green checkmark if the rip was done in secure mode and no errors were found.

I do recommend going into the settings and checking the box that allows for automatic creation of Secure Rip Logs. This is a text file that will go into each folder with a ripped album, and gives a full report on the accuracy of your rip. If you ever run into problems playing back those rips on the computer later, you can always refer back to the log. That will help you determine whether it's a hardware/software issue rather than the files you ripped.

Of course, if you do get an inaccurate rip in secure mode, the easiest thing to do at that point is to check the disc to see if it's clean and try ripping again. Some discs may have glitches due to bad manufacturing (rare, but can happen) and will never rip accurately even though they play back okay on a CD player. IIRC this is due to the interpolation function on a CD player that fills in or glosses over errors by inserting samples or silence. Out of thousands of discs, I've only had it happen with a handful, but it can happen.