An SD card is a postage-stamp-sized piece of technology that provides removable extra memory for digital cameras and other devices. SD cards can store pictures, videos, music, and other digital media.
Brand
SD memory cards carry familiar and trusted brand names as well as names new to the market or crossing from data storage into photography. As of September 2010 they include SanDisk, Kodak, Kingston, Lexar, Panasonic and Canon. Not all SD cards are manufactured by the companies whose names they bear, but since they have no moving parts, there's little difference in manufacturing processes.
Capacity
SD cards come in a range of memory sizes from 128 megabytes to 64 gigabytes. Check your camera's operating instructions for limits to the size it can handle. A digital picture's memory size can range from 500 to 700 kilobytes. A digital video will take up a larger amount of space depending on the length, usually about 50 megabytes per minute of video.
Price
SD cards are generally priced by capacity, from as little as $11 to as much as $74.
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