Definition

Noun: * (Computer Science) Memory whose contents can be accessed and read but cannot be changed: A type of computer memory or storage device where data is permanently stored during manufacturing. The information can be retrieved (read) by a computer but cannot be modified, overwritten, or erased by normal computer operations.

Usage

• This term is used to describe a fundamental type of non-volatile memory in computing.
• It is often discussed in contrast to read-write storage (like RAM or hard drives).
• It is commonly abbreviated as ROS or, more frequently, ROM (Read-Only Memory).

Examples

Advanced Usage

• Firmware: Software that is permanently programmed into a hardware device, often residing in read-only storage.
  • The router's firmware is burned into its read-only storage chip.
• The concept is sometimes metaphorically used to describe information that is fixed and unalterable.
  • The ancient text was like read-only storage for their cultural laws.

Variants and Related Words

• ROM (Read-Only Memory): The most common synonym and abbreviation for read-only storage.
• Mask ROM: A type of ROM where data is physically encoded during the chip's manufacturing.
• PROM (Programmable Read-Only Memory): A type of ROM that can be programmed by the user once.
• EPROM (Erasable Programmable Read-Only Memory): A type of ROM that can be erased with ultraviolet light and reprogrammed.
• EEPROM (Electrically Erasable Programmable Read-Only Memory): A type of ROM that can be erased and rewritten electrically.

Synonyms

• Non-volatile memory: Memory that retains data without power (a broader category that includes ROM).
• Fixed storage: Emphasizes the unchangeable nature of the data.
• Firmware storage: Highlights the common use case for holding firmware.

Antonyms

• Read-write storage / memory: Storage that allows data to be both read and modified (e.g., RAM, flash drives, hard disk drives).
• Volatile memory: Memory that loses its contents when power is removed (e.g., RAM).

Noun

1. (computer science) memory whose contents can be accessed and read but cannot be changed