fixed storage vs read-only storage

fixed storage and read-only storage both are nouns.

Word	Noun	Adjective	Verb	Adverb
fixed storage	Yes	No	No	No
read-only storage	Yes	No	No	No

As nouns, fixed storage and read-only storage are synonyms defined as:

fixed storage and read-only storage: (computer science) memory whose contents can be accessed and read but cannot be changed

Other synonyms of fixed storage include read-only memory, ROM.

fixed storage (noun)	read-only storage (noun)
(computer science) memory whose contents can be accessed and read but cannot be changed	(computer science) memory whose contents can be accessed and read but cannot be changed