Yep, my Dad first introduced me to computers back in the early 70's at his work. They had this big room filled from end to end with hard disc drives. It was SOOOOO freaking loud, like a machine shop. They had dedicated a/c units to cool the room. Easily 100-200 drives. And now, my watch has as much computing power. :O)
They were using punch cards too in another room. :O)