I recall using 7 or 7.5 inch floppies in the “console” of a Digital VAX 11/780. The floppy was needed to start an embedded LSI-11 computer which functioned as the VAX console. I never actually measured the floppy, could have been close to 8 inches. Also don’t recall the capacity.
I’ve heard about 15 inch floppies, but never actually seen one.
Speaking about storage,That bay on the right is a RANDOM ACCESS cassette drive. The cassettes looked the same as the audio cassettes of that day to me. And it was relatively fast! You would not believe what that system cost back then! I used it when I was working at an Army Research Center while in college.
When I got my first home machine a few years later with a cassette drive I was so disappointed with the drive performance compared to that of that HP “calculator” !