4 GB C Series Memory Module—The NI‑9802 secure digital (SD) module provides removable, solid-state, nonvolatile data storage expansion for your CompactRIO data-logging applications. Removable SD media make rapid storage expansion possible, and the rugged CompactRIO form factor offers the same extreme industrial certifications and ratings as other CompactRIO products. The NI‑9802 also offers open media bay detection for data protection.