EOS 5D Mark IV: Servo AF

The EOS 5D Mark IV, like most recent EOS cameras, features the ability to set the recording quality to RAW, M-RAW and S-RAW as well as a variety of JPEG options. If you plan to shoot in Servo AF (AI Servo) to track moving subjects, then no matter which RAW setting you use (RAW, M-RAW or S-RAW) your images will be recorded in full RAW. If you have AI Servo enabled, you will be unable to set M-RAW or S-RAW. To use either of the smaller RAW file options, select One Shot focus instead.
Camera settings
EOS 5D Mark IV