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Secure Digital

Secure digital or (sd) is a non-volatile memory card format for use in portable devices, such as mobile phones, digital cameras, gps navigation devices, and tablet computers. the secure digital standard is maintained by the sd card association (sda). sd technologies have been implemented in more than 400 brands across dozens of product categories and more than 8,000 models. the secure digital format includes four card families available in three different form factors.