Floppy and USB Timeline By Zachary.Boni.McCann Sep 21, 1972 8-inch: Memorex 650 175kB 1.5 megabit[32] Sep 21, 1978 51/4-inch DD 360 or 800 kB Sep 21, 1982 51/4-inch HD 1,200kB Sep 21, 1984 31/2-inch DS DD 720 kB (800 on Macintosh, 880KB on Amiga) Sep 21, 1986 31/2-inch HD 1440 kD (1,760 kB on Amiga) Sep 21, 1987 3 1/2-inch ED 2880 kB
