5 MB of storage on fifty 24” disks.

Going back a bit further than usual this time. I was visiting Squaw Valley, which hosted the 1960 Winter Olympics. Apparently, this was the first Olympic Games to use electronic data processing. In this case the mighty IBM RAMAC 305.

One of IBM’s last vacuum tube machines, the 305 weighed in at over a ton and was the first commercial computer that used a moving-head hard disk drive for secondary storage.

Data was stored on fifty 24” disks. With a storage capacity of 5MB, that was approximately 102 KB per disk.

Wikipedia link