Secure Digital (SD) is a non-volatile memory card format developed by Panasonic, SanDisk, and Toshiba for 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 an official maximum capacity of 2 GB, though technically they can store up to 4 GB.[1] SDHC (High-capacity) cards have a maximum capacity of 32 GB. SDXC (eXtended Capacity), a specification announced at the 2009 Consumer Electronics Show, allows for up to 2 TiB 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 (≤4 GB) unable to handle newer formats such as SDHC (≥4 GB). All SD cards have the same physical shape, which causes confusion for many consumers
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