1) A method of using a particular code to record digital data and get the flux reversal times from the data pattern. MFM recording is self-clocking because the code guarantees timing information for the playback process. The controller is able to synchronize directly from the data. This method has a maximum of one bit of data with each flux reversal. See NRZ and RLL. 2) Recording code used on floppy-interface QIC drives. It is the most efficient self-clocking code, but requires "good" electronics to decode.