A data card was a storage medium used in the 22nd century. Data cards consisted of several memory chips encased in a transparent coating and were similar to microtapes used in the 23rd century. Most of the control consoles aboard NX-class starships had slots for several data cards.
Aboard the NX-class Enterprise in early 2152, Commander Charles "Trip" Tucker showed Captain Jonathan Archer a data card. The card contained a complete recording of a water polo final between Stanford University and the University of Texas. Trip had received the recording by subspace before storing it on the data card. He and Archer later used the card to watch the game on a monitor in the captain's mess. (ENT: "Vox Sola")