Software behavior is analyzed. A disk drive controller has a processor executing computer software stored in a memory communicating with the processor via a local bus. In the controller, computer executable program code is identified that includes a set of computer executable program instructions for recording analytical data for at least a subset of the computer executable program code. The set of computer executable program instructions is disabled from executing. Without halting execution of the computer executable program code, execution of the set of computer executable program instructions is enabled.