Datatrax are a Transformer's memory and data storage system. They are connected and part of the Cognitive circuits built in to the CPU, and directly connected to the Spark chamber. They also hold the genetic information, a coded version of an Organic's DNA, of a Transformer. Dictating what size, faction, and general appearance of the individual.
They can be altered with illegal shell programs. These can corrupt the Protoform, turning him either Autobot-Decepticon, or Maximal-Predacon.