Abstract: A robot for data logging is described as a module of a portable data transfer system for use in physically transferring very big amounts of data in secure, fast and cheap way. The data logger logs and optionally analyzes sensory and operation data by statistically correlating and combining data, events, and control data from a variety of system modules, user actions, and sensors used to track system transit, handling, operation, and events. The data logger allows forensic analysis and comparison against a mission description to identify system location, transit path, mishandling, tampering, security breaches and problems arising from environmental conditions, design problems, etc. As a result, persons or events causing problems can be identified, retrained, and rectified, and system debugging can solve problems with error in hardware and software.