SD memory card
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sd memory card
Secure Digital (SD) is a non-volatile memory card use in portable devices. It is widely used in digital cameras, digital camcorders, handheld computers, netbook computers, PDAs, media players, mobile phones, GPS receivers, and video games. Standard SD cards have a maximum of 4 GB capacity. But only <=2 GB is allowed by the official standard.  The capacity range for standard- and high-capacity (SDHC) cards overlap, beginning at 4 GB, but SDHC reaches as high as 32 GB in mid-2009. SDXC (eXtended Capacity) , a specification announced at the 2009 Consumer Electronics Show, allows for up to 2 TB cards.
The format has proven very popular. Changes to the interface of the established format have made some older devices designed for standard SD cards (<=4GB) unable to handle newer formats such as SDHC (>=4GB) . All SD-cards have the same physical shape and form factor however, which causes confusion for many consumers.