Invented by Alan Shugart at IBM in 1967, the original floppy disk design measured 8 inches (200mm) in diameter, stored 80KB of data and became available for purchase in 1971 as a part of IBM's ...

IBM offered an extra-high density 2.88MB drive on selected PCs that was backward compatible, but the format never caught on. Floppy Disk Formats 720KB 3.5" DS/DD 1.44MB 3.5" DS/HD 2.88MB 3.5" DS ...

See Zip disk and Floptical. (2) An earlier 3.5" floppy disk developed by IBM and available on certain IBM PCs. With a 2.88MB capacity, the Extra High Density (ED) floppy drives were compatible ...

In the case of Copy-Lock, Sector 1 on track 6 was intentionally written as only 256 bytes ... you can’t create this disk structure with a standard IBM PC floppy disk controller; you need ...