Microdyne coupler

A microdyne coupler was a device that could be used to delete information on a computer, leaving little or no trace.

In 2154, Lieutenant Reed used one of these to delete information stored in a data recorder which the crew of Enterprise had retrieved from the wreckage of a Rigelian freighter. Reed's attempt to erase the information was unsuccessful, leading Captain Archer to learn that the lieutenant was holding back important information from the Starfleet crew. 

In 2375, Crewman Kellin told Ezri Dax to get a microdyne coupler and recalibrate a transtator.