disc / disk are similar-sounding terms with different meanings (referred to as homophones). To better understand the differences, see below for definitions, pronunciation guides, and example sentences using each term. 👇
disc: NA
disk: (noun) something with a round shape resembling a flat circular plate. (noun) a flat circular plate.
disc: d·IH·s·k
disk: d·IH·s·k
(Examples are Wikipedia snippets under the CC ShareAlike 3.0 license. Definitions drawn from WordNet.)