He says in a new book that the airline industry is one of his biggest customers.
"These are people who use floppy disks as a way to get information in and out of a machine.
He also said that the medical sector still uses floppy disks.
And then there's "hobbyists," who want to "buy ten, 20, or maybe 50 floppy disks."
Floppy disks made news recently when Japan's digital minister, Taro Kano, declared "a war" on the devices, tweeting earlier this month that Japan's digital agency would change regulations requiring businesses to use floppy disks and CDs, instead shifting to online services.