Which component is a non-volatile storage device used for permanent data storage?

Which component is a non-volatile storage device used for permanent data storage?

• A. RAM
• B. Hard disk
• C. ROM
• D. Cache

Answer: (B)

Non-volatile storage retains data without power, which is essential for keeping information long-term. The hard disk fits this role because it stores files, the operating system, and programs on magnetic media, and these remain available even when the computer is powered off. RAM and cache, by contrast, are volatile and lose their contents when power is removed, so they’re only for temporary data during operation. ROM is non-volatile too, but it’s mainly for firmware and system instructions that don’t change like user data; it isn’t used for storing regular, permanent data. So, for permanent data storage, the hard disk is the appropriate choice.

Non-volatile storage retains data without power, which is essential for keeping information long-term. The hard disk fits this role because it stores files, the operating system, and programs on magnetic media, and these remain available even when the computer is powered off. RAM and cache, by contrast, are volatile and lose their contents when power is removed, so they’re only for temporary data during operation. ROM is non-volatile too, but it’s mainly for firmware and system instructions that don’t change like user data; it isn’t used for storing regular, permanent data. So, for permanent data storage, the hard disk is the appropriate choice.