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Comment by adrianmonk | Hacker News Reader

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Wikipedia agrees (https://en.wikipedia.org/wiki/History_of_the_floppy_disk):

8-inch: 1972

5.25-inch: 1976

3.5-inch: 1982

The IBM 23FD (read-only) was released for the System 370 in 1971. The first read-write floppy drive, Memorex 650, was available in 1972.

https://www.computerhistory.org/timeline/1968/

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