content: 80 MBs might not have ever existed as drum memory. Maybe you meant 80K (or 8MB?) June 18, 1959 the IBM 650 Model 4 had only 17 kilobytes (not megabytes) of drum storage The UNIVAC Series 1100 drum from 1956 (older tech) had merely 180,000 characters (under 170 kiloBYTES) It is true that for LOW performance , larger capacity some multi megabyte drums were made. The manufacture of drums ceased in the 1970s. You might be thinking of disc-packs not drum memory.