disk (n.)youdaoicibaDictYouDict[disk 词源字典]
American English preferred spelling, 1660s, "round flat surface," from Latin discus "quoit, discus, disk," from Greek diskos "disk, quoit, platter," related to dikein "throw," from PIE *dik-skos-, from root *deik- "to show, pronounce solemnly; also in derivatives referring to the directing of words or objects" [Watkins]; see diction.

Sense of "phonograph disk" is 1888; computing sense is from 1947. Disk jockey first recorded 1941; dee-jay is from 1955; DJ is 1961; video version veejay is 1982. Disk-drive is from 1952.[disk etymology, disk origin, 英语词源]
gold (adj.)youdaoicibaDictYouDict
c. 1200, from gold (n.); compare golden. In reference to the color of the metal, it is recorded from c. 1400. Gold rush is attested from 1859, originally in an Australian context. Gold medal as first prize is from 1757. Gold record, a framed, gold phonograph record to commemorate a certain level of sales, is from 1948.
Joe Grady and Ed Hurst, WPEN disk jockey team, will be given a gold record by Mercury of the one-millionth copy of Frankie Lane's waxing of That's My Desire, January 10, for having done so much to plug the platter in these parts [Philadelphia]" [Billboard, Jan. 10, 1948]