My MacBook's drive is typically fully functional (for most discs), but I've recently noticed that it refuses to read discs with a paint coat (such as most commercial software). What could have caused my MacBook to experience such an issue? (it didn't happen before).
Details: When inserted, the drive would spin up, seemingly as if nothing was wrong, but after about 15 seconds, it slows down. It repeats this a few times and eventually results in the disc being ejected.