What format is commonly used for non-volatile memory cards in portable devices?

The Secure Digital (SD) format is widely used for non-volatile memory cards in portable devices, making it the most appropriate choice in this context. SD cards are favored for their compact size, versatility, and wide compatibility with a variety of devices, including cameras, smartphones, and gaming consoles. They come in different capacities and variants, including Standard SD, SDHC (High Capacity), and SDXC (Extended Capacity), which allows them to suit a range of storage needs.

While other formats like Compact Flash (CF), Micro SD, and Memory Stick are also utilized in various applications, SD cards have become the industry standard for many portable devices due to their balance of size, performance, and mass adoption across manufacturers.