2352 bytes RAW Data + 16 Bytes P-Q Subchannel Data. It allows writing of most subchannel information, including most Digital Signatures, ISRC, Catalog Numbers, Gaps, Indices and Crazy TOCs.
DAO RAW 16 handles everything else besides LibCrypt protection. Few drives support only DAO RAW 16 (like HP 8250 and newer Philips drives). Plextor/Sony CRX support only DAO RAW 96. Mitsumi and Ricoh have both. You can tell if a drive has DAO RAW 16 if the "raw" checkbox in CDRWin works.