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.
Commodore 64 peripherals
In the mid-1980s, a 2.8-inch floppy disk drive, the Triton Disk Drive and Controller, was introduced by Radofin Electronics, Ltd. It was compatible with the Commodore 64 as well as other popular home computers of the time, thanks to an operating system stored on an EPROM on an external controller. It offered a capacity of 144/100 kilobytes non-formatted/formatted, and data transfer rates of up to 100 kilobytes per second. Up to 20 files could be kept on each side of the double-sided floppy disks.