![File:ERA Magnetic Drum, US, c. 1951 - Computer History Museum - Mountain View, California.jpg - Wikimedia Commons File:ERA Magnetic Drum, US, c. 1951 - Computer History Museum - Mountain View, California.jpg - Wikimedia Commons](https://upload.wikimedia.org/wikipedia/commons/4/4f/ERA_Magnetic_Drum%2C_US%2C_c._1951_-_Computer_History_Museum_-_Mountain_View%2C_California.jpg)
File:ERA Magnetic Drum, US, c. 1951 - Computer History Museum - Mountain View, California.jpg - Wikimedia Commons
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. | Forum for Electronics
![India's Largest House of Psychological Tests | Seller and distributor of Psychological Books | National Psychological Corportaion India's Largest House of Psychological Tests | Seller and distributor of Psychological Books | National Psychological Corportaion](https://admin.npcindia.com/products/1000048/19112021111139793-Memory%20Drum.jpg)