" Luke nodded. He'd refused to let them wipe the X-wing's computer every few months, as per standard procedure. The inevitable result was that the computer had effectively molded itself around Artoo's unique personality, so much so that the relationship was almost up to true droid counterpart level. It made for excellent operational speed and efficiency; unfortunately, it also meant that none of the maintenance computers could talk to the X-wing anymore. "
― Timothy Zahn , Heir to the Empire (Star Wars: The Thrawn Trilogy, #1)