It's fun that the same algorithm applies to two different problems. In the disk case, the only unpredictable thing is future requests. Elevators have to deal wi

It's fun that the same algorithm applies to two different problems. In the disk case, the only unpredictable thing is future requests. Elevators have to deal with two unpredictable things, future requests as well as how long humans take to get in and out of the elevator. So it's doubly fun that the same algorithm works in both cases!