/products/manufacturers/wuerth-elektronik/b/blog/posts/offline-memory-technology-1467719318Part 6: Modern Card Standards Secure Digital (SD) is a Non-Volatile Memory format developed by the SD Card Association (SDA) for use in portable devices. It was launched in 1999 to improve the MMC standard. SanDisk, Panasonic and Toshiba collaborateden-USTelligent Community 12