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I believe the 400,000 number the answer refers to is the number of rotations per minute, as opposed to per second. This lead to confusion for me the firs time I read the question through.
@fuzzyTew, I haven't found a replacement for the rotating cone link, sorry. The picture is from the link in 2013 and seems schematic rather than detailed. It might be easier to use a belt, gear, or roller drive vs. finding a hollow-body stepper motor.
@Shahbaz, since Frank still hasn't replied to your comment above, I think it's safe to say that 2mb per second means 2 millibits per second, so his system is processing less than 9K bytes per year.
