Disk
mid 17th century (originally referring to the seemingly flat circular form of the sun or moon): from French disque or Latin discus (see discus).
wiktionary
From Ancient Greek δίσκος(dískos, “a circular plate suited for hurling”), from δικέω(dikéō, “to hurl, to launch”). Doublet of dais, desk, disc, discus, dish, and diskos.
etymonline
disk (n.)
1660s, "round, approximately flat surface," from Latin discus "quoit, discus, disk," from Greek diskos "disk, quoit, platter," related to dikein "to throw" (see discus).
The American English preferred spelling; also see disc. From 1803 as "thin, circular plate;" sense of "phonograph disk" is by 1888; computing sense is from 1947. Disk jockey first recorded 1941; dee-jay is from 1955; DJ is by 1961; video version veejay is from 1982. Disk-drive is from 1952.
