B-key

The B-key is a feature found on certain computer storage cards, specifically SD (Secure Digital) cards. It is a connector notch that indicates the card's compatibility with specific types of devices or data interfaces. The B-key is designed to prevent users from inserting the card into incompatible slots, helping to ensure proper use. Typically, B-key SD cards are used for higher-capacity storage or specialized applications, often supporting the SDHC (Secure Digital High Capacity) or SDXC (Secure Digital eXtended Capacity) standards. In summary, the B-key helps match the right card with the compatible device to ensure correct and safe operation.