Yoshiro Nakamatsu
Nakamatsu claims IBM reached licensing agreements with him in the late 1970s. He also claims to have licensed his floppy disk to IBM in 1979, but that the details are "confidential". An IBM spokesman, Mac Jeffery, confirmed that the company did license some of his patents, but claimed they were not for the floppy disk, which he claimed IBM invented on its own. Another IBM spokesman, Brian Doyle, said they licensed 14 patents from Nakamatsu, but also claimed that they do not have anything to do with the floppy disk.
Floppy disk variants
In 1994, Iomega introduced the Zip drive. Although neither size (the original or the later Pocket Zip drive) conforms to the 3½-inch form factor and hence is not compatible with standard 1.44 MB drives, the original physical size still became the most popular of the "super floppies". The first version boasted 100 MB; later versions boasted 250 MB and then 750 MB of storage, until the PocketZip (formerly known as Clik!) was developed with 40 MB. Though Zip drives gained in popularity for several years they never reached the same market penetration as standard floppy drives, since only some new computers were sold with the drives.