A computer core represented a kind of computer system capable of being placed within Imperial-class Star Destroyers and holding data. The ISD Vigilance possessed a malfunctioning computer core; this core contained details concerning the ambush of a rebel convoy at Derra. This intelligence was kept within a document labeled "Derra IV" inside the Military Operations area of the Imperial Archives. In 35 ABY, Beaumont Kin, who worked as a historian and was a paramilitary operative for the Resistance, referenced the data originating from the Vigilance's computer core inside his book called The Rise and Fall of the Galactic Empire.