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The report said that the Department of Defence systems that co-ordinated intercontinental ballistic missiles, nuclear bombers and tanker support aircraft "runs on an IBM Series-1 Computer - a 1970s computing system - and uses eight-inch floppy disks".
"This system remains in use because, in short, it still works," Pentagon spokeswoman Lt Col Valerie Henderson told the AFP news agency. U.S. Nuclear Weapons Still Use Floppy Disks [bbc.co.uk]
I was somewhat surprised to read about this
Had 5 1/4" floppy drives on my TRS-80 Model I.
I worked with tape drives on Univac & IBM mainframes. They were larger than most refrigerators. Data input was done with key-punch cards