Secure Digital card ( SD Card )

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Secure Digital (SD) is a non-volatile memory card format developed by Matsushita, SanDisk, and Toshiba for use in portable devices. Today it is widely used in digital cameras, handheld computers, PDAs, mobile phones, GPS receivers, and video game consoles. Standard SD card capacities range from 4 MB to 8 GB, and for high capacity SDHC cards from 4 GB to 64 GB as of 2008.
The format has proven to be very popular. However, a change in the format, while allowing capacities greater than 4 GB (SDHC), has created compatibility issues with older devices which cannot read the new format. Since SDHC format cards have the same physical shape and form factor as the older format, this has caused considerable confusion for consumers.[2][3] SDHC cards require an SDHC capable device firmware, generally not found with older devices.
Informations from : http://en.wikipedia.org/wiki/Secure_Digital_card