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Digital cameras use a range of memory cards, including CompactFlash, xD Picture Card, SD Memory Card, miniSD and microSD to name but a few.

But the most popular by far is the SD card and its wide ranging family. SD, which stands for Secure Digital is a non-volatile memory card format that is used across more than 400 brands, in numerous product categories, and is considered the de-facto industry standard.

At present, all the leading digital camera manufacturers use SD cards in their products, including Canon, Nikon, Sony, Kodak and Olympus. Some professional camera models and SLRs continue to offer CompactFlash due to its typically better price/capacity ratio and quicker transfer rates, but many also include an SD option for extra or alternative memory.

The SDSC (Secure Digital Standard-Capacity) card family has an official maximum capacity of only 2GB, but many are available up to 4GB, and SDHC (High Capacity) cards have capacities ranging from 4GB to 32GB.