Comment Fit 120 HDDs in 4U enclosure? (Score 1) 358
My rough calculation says the volume of 120 HDDs (3.5") will use 90% of the volume of a 4U container. I can't imagine how to physically position the HDDs inside the container.
Maybe they are using 2.5" HDDs each of which has 8x less volume than a 3.5" HDD. That would be an easier exercise.
In either case, the drives are probably not hot-swap (unless you do it like a puzzle)