I was just looking for one of these two days ago, and I didn't know what to call it. I haven't purchased an optical disk in a long time, but someone sent me on

I was just looking for one of these two days ago, and I didn't know what to call it. I haven't purchased an optical disk in a long time, but someone sent me one. Only then did it occur to me that I didn't have an optical drive in one of the computers I currently use.