Presumably this apple page is someone's idea of an April fool, date notwithstanding. "Disc" is the correct spelling of the flat circular thing. "Disk" was inv

Presumably this apple page is someone's idea of an April fool, date notwithstanding. "Disc" is the correct spelling of the flat circular thing. "Disk" was invented by someone in the 1980s either as an attempt at a trade name, or because they couldn't spell. Then other people continued the mis spelling.