5 MB Hard Drive Being Shipped Out, IBM, 1956
 

A blast from the past...
https://www.boredpanda.com/blog/wp-c...9-png__700.jpg

wow!wow!wow!

Wow thats big!!!!!!!

Yes, it was the first commercial disk drive data storage system. The IBM 305 RAMAC used a vacuum tube based computer, and vacuum tubes controlled the disk drive unit. Individual transistor (not integrated circuit) computers were introduced in the late 1950’s and early 1960’s. By 1970, computers used integrated circuits.
https://www.computerhistory.org/revo...-storage/8/233

Drum memory was developed a few years earlier, with one head per track.
https://www.computerhistory.org/revo...-storage/8/252

If you are ever in Silcon Valley (south end of the San Fransisco Bay Area), be sure to visit the Computer History Museum in Mountain View, near the current Google headquarters (Googleplex).

Bill