2352 bytes RAW Data. ISRC, Catalog Numbers and Indices can be written. Usually CD-Text, CD+G and CD+MIDI can be written as well. Crazy TOCs and Digital Signatures can't be written in this mode.
RAW-MMC-SAO is the technology, which CloneCD uses in order to be compatible with recorders, which not support MMC DAO RAW writing. It does not use any CUE sheets or similar. The data are transmitted to the writer by sessions.