One of the world’s most technologically advanced nations has held on to some of the most outmoded devices. By John Yoon Hisako Ueno and Kiuko Notoya Hisako Ueno has used floppy disks extensively.

An online merchant who runs one of the few remaining websites where you can buy floppy disks says they're still used in the medical and airline industries. When I was little, it was rare for people to ...