What is ECC memory?

• A. Error-Correcting Code RAM that detects/corrects single-bit errors and detects some multi-bit errors.
• B. A type of graphics memory.
• C. A type of solid-state storage.
• D. A memory module that cannot correct errors.

Answer: (A)

ECC memory uses extra error-detecting/correcting bits alongside the data in each memory word. Those codes let the memory controller identify when a bit has flipped and automatically fix that single-bit error on the fly. If more than one bit is corrupted, the code can usually detect that an error occurred, even if it can’t correct every case. This single-error-correct, double-error-detect capability is what makes ECC RAM especially reliable, so it’s commonly used in servers and other systems where data integrity is critical. It isn’t just graphics memory or solid-state storage, and unlike non-ECC RAM, it provides a practical way to correct errors rather than just hoping they aren’t happening.