Data chip
Vulcan data chips from the 2150s
A data chip was a type of crystalline data storage device used by various species.
In 2152, Doctor Yuris gave Sub-Commander T'Pol a container full of Vulcan data chips containing all available research on Pa'nar Syndrome. (ENT: "Stigma")
Skagaran data chips from the 19th century
Later in 2153, on a Skagaran colony planet, T'Pol and Commander Charles Tucker III recovered some Skagaran data chips from a data module in a crashed 19th century Skagaran starship. After showing Captain Jonathan Archer the data chips, Tucker and T'Pol took the data chips back to Enterprise NX-01 in an effort to recover information on the history of the colony. (ENT: "North Star")
Accessing a mirror universe Vulcan data chip
When the USS Discovery found itself in the mirror universe in 2257, Ash Tyler recovered a data core from the wreckage of a nearby Klingon raider containing what Michael Burnham recognized to be Vulcan data chips. These data chips were translucent blue, individually pyramid-shaped, connecting together in sets forming an octahedron. Burnham concluded from these data chips that, in that universe, the Vulcans were sharing technology with the Klingons through an alliance. (DIS: "Despite Yourself")
Soon after, the mirror Shukar provided Burnham the locations of rebel listening posts on a Vulcan data chip as part of a plan to deceive the Terran emperor. (DIS: "The Wolf Inside")
A Kerkhovian data chip
In 2259, the Kerkhovians left a data chip on the shuttle Cervantes after repairing the damaged caused when it collided with their transport tunnel. The chip contained routing instructions for contacting the Kerkhovians via subspace; it was thus characterized as a "calling card" by Ensign Nyota Uhura. (SNW: "Charades")
In 2401, Commander Ro Laren gave her Bajoran earring to Admiral Jean-Luc Picard just before her assassination. The earring was later found to contain a data chip detailing Ro's investigation into a widespread Changeling infiltration of Starfleet. (PIC: "Imposters")