How to: Purchase an SD Card: Definitions of Speed Classes, Sizes, and Capacity

A Secure Digital (SD) card is a small flash memory card used in automobile navigation systems, cellular phones, e-books, PDAs, smartphones, digital cameras, music players, digital video camcorders, and personal computers.

SanDisk Corp., Panasonic Corp. (previously Matsushita Electric Industrial Co. Ltd.), and Toshiba Corp. agreed in 1999 to jointly develop and sell the Secure Digital card standard, an upgrade to the MultiMediaCard standard (MMC).

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