SD is acronym for "Secure Digital".
From wikipedia (http://en.wikipedia.org/wiki/Secure_Digital_card)
Secure Digital (SD) is a flash (non-volatile) memory card format developed by Matsushita, SanDisk and Toshiba for use in portable devices, including digital cameras, handheld computers, PDAs and GPS units. As of 2006, SD card capacities include 8, 16, 32, 64, 128, 256, and 512 MB, 1, 2, 4, 6, 8 GB (4-32 GB: SDHC)
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