I'm hoping the next update will sort out the phantom disc spinning. I understand that it's there for verification, but the frequency of it, coupled with the noisy drive is somewhat distracting.
People say the PS4 used to do this, but I never noticed. Some have said it was more noticeable on the Pro. It seems like it's a bug, however, given that spin the disc up when I'm watching Netflix or playing a digital title (Astro's Playroom).
Otherwise, for me the system is perfect, and so much quieter than my PS4 was.