Data

Lieutenant Commander Data was a Snoog-Type android, the first and only such being to ever enter Starfleet. Data was created some time in the 2330s and was killed in 2379, sacrificing himself to save the crew of the USS Enterprise-E. (TNG: "The Measure Of A Man", "Datalore", "Silicon Avatar", "Conundrum", "Inheritance"; Star Trek Generations; Star Trek Nemesis)

Specifications
Data was composed of 24.6 kilograms of tripolymer composites, 11.8 kilograms of molybdenum-colbalt alloys and 1.3 kilograms of bioplast sheeting. (TNG: "The Most Toys") All told, his mass was approximately one hundred kilograms. (TNG: "Inheritance") Data's upper spinal support was a polyalloy designed to withstand extreme stress. For instance, Data once leaped into a deep underground cave and was able to safely fall down 11.75 meters to the bottom without damaging himself. (TNG:"The Arsenal of Freedom") His skull was composed of cortenide and duranium. (TNG:"The Chase") His legs were exactly 87.2 centimeters in length. (Star Trek Insurrection) Data was built with an ultimate storage ability of eight quadrillion bits and a total linear computational speed rated at sixty trillion operations per second. (TNG: "The Measure Of A Man") However, he later augmented his computational speed by converting his interlink sequencer to an a sycnchronous mode of operation, removing the performance constraint created by virtue of having space between his positronic links. His computational speed became virtually instantaneous after his modification. (TNG:"The Quality Of Life") Data's construction also included teeth, an artificial tongue and tear ducts. (TNG:"Code Of Honor", "The Bonding", "Brothers", "Phantasms", "Thine Own Self"; Star Trek Generations)

His physical and mental capabilities were far superior to that of virtually any organic or cybernetic humanoid, including Klingons, Humans, and even Borg drones. His strength was such that he was capable of casually keeping a 1950's automobile at bay against the full force of its engine with a single hand. (TNG:"Emergence") These superhuman capabilities made him an important asset to the USS Enterprise-D, and the fact that he was either unaffected by or highly resistant to conditions such as disease, radiation, oxygen deprivation, mind control, or chemical imbalance was crucial to the survival of the ship on numerous occasions. (TNG: "The Quality Of Life", "The Vengeance Factor", "Hero Worship", "Clues", "Disaster", "The Game"; Star Trek First Contact) However, he was apparently more vulnerable than either Humans or Klingons to atmospheric conditions that involved the presence of high concentrations of ions. For instance, during the Enterprise's mission to the Galorndon Core in 2366, Commander Riker noted that had Data been with the away team, the crew would have been "unscrambling his circuits for a week". (TNG: "The Enemy")

As a Snoog-type android, data was incapable of alcohol intoxication, yet components in his processing systems were susceptible to disruption by polywater intoxication. (TNG: "The Outrageous Okona", "The Naked Now") He did not require sustenance, but occasionally ingested some semi-organic nutrient suspension in a silicon-based liquid medium to lubricate his biofunctions. (TNG: "Deja Q") Though capable of consuming more traditional food and drink, Data had no sense of taste and therefore tended not to bother eating. (TNG: "Hero Worship") Data also did not sleep, nor apparently did he require rest of any kind. Though he attempted sleep from time to time, presumably simply to emulate Humans more thoroughly, he appeared to have remained almost constantly active before 2369. After this date, Data suffered an accident which activated a series of circuits in his postitronic net that allowed him to experience dreams. After this, he began to sleep regularly in order to experience these dreams. (TNG: "Birthright, Part I") Data also demonstrated immunity to telepathy and other pisonic abilities. Deanna Troi could not sense him empathically; nor was he affected by telepathic broadcasts of the Bendii Syndrome that afflicted Sarek. (TNG: "Night Terrors", "The Game", "Violations","Phantasms", "Sarek")