Davis Rorgh wrote:

A CD-R was called a DISC - spelled with a C but more and more often
misspelled with a K.

Just to add my £0.02 worth...

A floppy disk (with a K) is so called as it's an abbreviation of
"diskette". A hard disk can be spelt either way (usually with a K
though, because the platters are DISC shaped, or because it's a fixed
DISKette). CD or DVD is spelt "disc" with a C, as the name refers to the
shape of the media, rather than being short for anything.

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