A datacard is any removable computer component, approximately the size of a credit card, that contains data, or that contains nonvolatile memory to which data can be written and from which data can be recovered. The term is a synonym for smart card.
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Some datacards are portable devices and include such components as flash memory modules and proprietary memory sticks. They are useful for the transfer of files among computers and for short-term data backup. Still other datacards are used with notebook computers to provide mobile wireless Internet access.