I meant One S and One X, plus Series X. The One S and One X are refreshes of the One, with the One S getting 4K HDMI and Blu-ray support and the One X getting both of those plus more power and 4K gaming support. There was a version of the One S that didn't have an optical drive, but it was a bit of a flop. The Series X is one of the two successors to the One line (along with the Series S), with the Series X having a 4K Blu-ray drive and the Series S not having an optical drive.

Source: I own all of them except for the One X.

My Xbox One X legitimately has no disc drive.

The Xbox One X certainly does have a disc drive, it's a little out-of-the-way though. Check on the left side of the front of the console, under the overhang.

Not to dump on LoganDark, but I find it absolutely fascinating that you owned an Xbox and legitimately only today discovered that it has an optical drive!

EDIT: Definitely shows the shift to online game delivery in a way that I have not seen before.

I grew up with a 360, and knew about the drive on the original Xbox One, but I really could not tell that my Xbox One X had a disc drive. I don't know how I missed it.

I checked and you are right, apparently it does. It's weird that I was never able to find it before, because I did look under the overhang, but was unable to get any discs in there. Oops.

Weird, everyone I can find online says that the One X has a disc drive.