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A CFexpress Type B card is a high-speed, durable memory card designed for professional use, such as shooting high-resolution photos and 8K video. It uses the PCIe 3.0 interface and NVMe protocol for speeds much faster than traditional SD cards, and its rugged construction makes it resistant to shock, vibration, and extreme temperatures. Unlike Type A cards, the larger Type B is not physically interchangeable with Type A slots.