Magnetic drum memory Invented all the way back in 1932 (in Austria), it was widely used in the 1950s and 60s as the main working memory of computers. In. - ppt download
Inside the Bendix G-15's Magnetic Drum Memory - Continuity - Scanalyst
File:TitanII MGC magnetic drum.jpg - Wikipedia
A brief history of memory and storage - Koofr blog
Drum memory - Wikipedia
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Magnetic Drum Memory, c. 1951, ≈256 bytes/in², University of Auckland | Computer history, Old computers, Free energy generator