disc space vs disk space

disc space and disk space both are nouns.

Word	Noun	Adjective	Verb	Adverb
disc space	Yes	No	No	No
disk space	Yes	No	No	No

As nouns, disc space and disk space are synonyms defined as:

disc space and disk space: (computer science) the space available on a magnetic disk

disc space (noun)	disk space (noun)
(computer science) the space available on a magnetic disk	(computer science) the space available on a magnetic disk