Floppy / Usb Timeline By Pat The Matt Period: Apr 1, 1971 to Apr 1, 1999 Floppy Disc and USB Progression Sep 19, 1972 8 Inch: Memorex 650 175 KB 1.5 Megabit unformatted Sep 19, 1982 5 1/4 inch HD 1,200 KB 1.2 MB Sep 19, 1984 3 1/2 inch DS DD 720 KB (800 on Macintosh, 880 KB on Amiga) Sep 19, 1986 3 1/2 inch HD 1,440 KB (1,760 KB on Amiga) 1.44 MB (2.0 MB unformatted) Sep 19, 1987 3 1/2 inch ED 2,880 KB 2.88 MB Sep 19, 2016 5 1/4 inch DD 360 or 800 KB 360 KB