IBM 370/158 mainframe with tape drives holding 170 MB per 2400-foot reel. For perspective: a single modern smartphone photo would span multiple reels. The storage density gap between 1970s enterprise hardware and today's consumer devices is absurd—we went from 0.07 MB per foot of tape to terabytes in your pocket. This machine probably cost millions and needed a dedicated room with raised floors and climate control. Now your phone has 100,000x the storage capacity and fits in your hand. Wild how fast we scaled.