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What are SD (Secure Digital) memory cards?

April 26, 2017cards digital memory sd Secure

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What are SD (Secure Digital) memory cards?

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SD memory cards are currently the most popular format memory cards in use, as well as being the best value for money. SD cards come in different capacities such as 1GB, 2GB and 4GB. They also come with different speed ratings which refers to the speed that data can be transferred to the memory card. For example a high speed card would be labelled as say 130X and may have a transfer rate of 20 Mbps. Anything over 60X is generally considered to be a high speed card.