{PDF} ATA/ATAPI Command Set – 4 (ACS-4 r14) INCITS Technical Committee T13

The set of AT Attachment standards consists of this standard and the ATA implementation standards described in AT Attachment – 8 ATA/ATAPI Architecture Model (ATA8-AAM). This standard specifies the command set host systems use to access storage devices. This standard provides a common command set for systems manufacturers, system integrators, software suppliers, and suppliers of intelligent storage devices.