What is another word for read-only storage?
Pronunciation: [ɹˈiːdˈə͡ʊnli stˈɔːɹɪd͡ʒ] (IPA) 
Read-only storage, abbreviated as ROS, is a term used to refer to a type of computer memory that is used for storing data that cannot be altered or edited once it has been written. Another term used to describe ROS is "read-only memory" or ROM. The use of different terms often depends on the application of the memory, but they are all synonyms of each other. Other synonyms include "firmware," which is used for embedded systems such as microcontrollers and digital cameras, and "programmed read-only memory" or PROM, which can be programmed by the user but cannot be altered once programmed. Despite the different terms, all of these synonyms refer to a form of non-volatile memory that has read-only access.
