IBM invented the ATM, the PC and floppy disk.
Really? When?
world's first floppy disk and disk drive began in 1967 at a San Jose (CA) IBM facility, and introduced into the market in an 8-inch format in 1972. The more conveniently sized -inch disks were introduced in 1976, and became almost universal on dedicated word processing systems and personal computers. This format was more slowly replaced by the -inch format, first introduced in 1982. There was a significant period where both were popular. A number of other variant sizes were introduced over time, with limited market success.
Floppy disk variants
The floppy disk is a data storage and transfer device which was ubiquitous from the mid-1970s well into the 2000s. Besides the 3½-inch and 5¼-inch formats used in IBM PC compatible systems, or the 8-inch format that preceded them, many proprietary floppy disk formats were developed, either using a different disk design or special layout and encoding methods for the data held on the disk.
3-inch "MCD-1 Micro Cassette".
A 3-inch magnetic disc in a hard plastic shell was invented by Marcell Jánosi, who was