The South Korea Secure Digital Card Market Size is Anticipated to Hold a Significant Share by 2033, Growing at a CAGR of 5.7% from 2023 to 2033. A secure digital (SD) card is a small flash memory card produced to endure high-capacity storage and a wide range of portable devices, from GPS navigation systems, cell phones, e-books, PDAs, smartphones, digital cameras, music players, digital video camcorders, to personal computers.