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Primary storage, or internal memory, is computer memory that is accessible to the central...

Primary storage, or internal memory, is computer memory that is accessible to the central processing unit of a computer without the use of computer's input/output channels. Primary storage is used to store data that is likely to be in active use and is stored in locations selected by virtual address into a physical address. Primary storage is typically very fast, as in the case of RAM. RAM is also volatile, losing the stored information in an event of power loss, and quite expensive. ROM is not volatile, but is not suited to storage of changeable data which is what makes the computer a flexible tool of immense power; it is also somewhat more expensive to produce as ROM chips are machine dependent and so have less effective economies of scale. Typically, Programmable read-only Memory (EEPROM) must also be completely erased before it can be rewritten, making large scale use impractical for frequently changing data, if not impossible. Other types of ROM (PROM and EPROM) are even less flexible but have their niches in imbedded systems.) Therefore the use of ROM is limited to separate secondary storage such as for code to bootstrap a system, basic input output system (hardware driver