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This is great; I’d never heard about it.
Can you tell us anything more about that disk? IBM developed the first commercial disk drive in 1956 (the RAMAC 350 Storage Unit). It had 50 two-foot diameter disks (100 magnetic surfaces) and an overall capacity of 5 megabytes … 2,000 bits per square inch. (For comparison, today’s drives have more than 600 billion bits per square inch … and earlier this year Seagate said it had demonstrated a trillion bits per square in its research lab.) But the IBM disk’s magnetic surface was an annulus, (like a two-dimensional doughnut) and had a much bigger inside diameter than the one you showed in the video. I wonder who made it for the R1 folks.